X-Git-Url: http://git.indexdata.com/?a=blobdiff_plain;f=client.tcl;h=0ec50f9a2afd06a70400694b73d1288eb48a702c;hb=bbf493d419191bb2650c061f5f00a39f42cc272f;hp=7ef4fdeae17634d2d30e80180b666bc3bfadecb1;hpb=52284820cfaee3773182b71bc96fe2e307d9ee49;p=ir-tcl-moved-to-github.git

diff --git a/client.tcl b/client.tcl
index 7ef4fde..0ec50f9 100644
--- a/client.tcl
+++ b/client.tcl
@@ -4,7 +4,86 @@
 # Sebastian Hammer, Adam Dickmeiss
 #
 # $Log: client.tcl,v $
-# Revision 1.66  1995-08-29 15:30:13  adam
+# Revision 1.90  1996-03-20 13:54:02  adam
+# The Tcl_File structure is only manipulated in the Tk-event interface
+# in tkinit.c.
+#
+# Revision 1.89  1996/03/05  09:16:04  adam
+# Sets tearoff to off on several menus.
+#
+# Revision 1.88  1996/01/23  15:24:09  adam
+# Wrore more comments.
+#
+# Revision 1.87  1996/01/22  17:13:34  adam
+# Wrote comments.
+#
+# Revision 1.86  1996/01/22  09:29:01  adam
+# Wrote comments.
+#
+# Revision 1.85  1996/01/19  16:22:36  adam
+# New method: apduDump - returns information about last incoming APDU.
+#
+# Revision 1.84  1996/01/11  13:12:10  adam
+# Bug fix.
+#
+# Revision 1.83  1995/11/28  17:26:36  adam
+# Removed Carriage return from ir-tcl.c!
+# Removed misc. debug logs.
+#
+# Revision 1.82  1995/11/02  08:47:56  adam
+# Text widgets are flat now.
+#
+# Revision 1.81  1995/10/19  10:34:43  adam
+# More configurable client.
+#
+# Revision 1.80  1995/10/18  17:20:32  adam
+# Work on target setup in client.tcl.
+#
+# Revision 1.79  1995/10/18  16:42:37  adam
+# New settings: smallSetElementSetNames and mediumSetElementSetNames.
+#
+# Revision 1.78  1995/10/18  15:45:36  quinn
+# *** empty log message ***
+#
+# Revision 1.77  1995/10/18  15:37:46  adam
+# Piggy-back present.
+#
+# Revision 1.76  1995/10/18  15:15:20  adam
+# Fixed bug.
+#
+# Revision 1.75  1995/10/17  14:18:05  adam
+# Minor changes in presentation formats.
+#
+# Revision 1.74  1995/10/17  12:18:57  adam
+# Bug fix: when target connection closed, the connection was not
+# properly reestablished.
+#
+# Revision 1.73  1995/10/17  10:58:06  adam
+# More work on presentation formats.
+#
+# Revision 1.72  1995/10/16  17:00:52  adam
+# New setting: elementSetNames.
+# Various client improvements. Medium presentation format looks better.
+#
+# Revision 1.71  1995/10/13  15:35:27  adam
+# Relational operators may be used in search entries - changes
+# in proc index-query.
+#
+# Revision 1.70  1995/10/12  14:46:52  adam
+# Better record popup windows. Next/prev buttons in popup record windows.
+# The record position in the raw format is much more visible.
+#
+# Revision 1.69  1995/09/21  13:42:54  adam
+# Bug fixes.
+#
+# Revision 1.68  1995/09/21  13:11:49  adam
+# Support of dynamic loading.
+# Test script uses load command if necessary.
+#
+# Revision 1.67  1995/09/20  14:35:19  adam
+# Minor changes.
+#
+# Revision 1.66  1995/08/29  15:30:13  adam
 # Work on GRS records.
 #
 # Revision 1.65  1995/08/24  15:39:09  adam
@@ -233,6 +312,7 @@
 #
 #
 
+# Procedure tk4 is defined - returns 0 if tk 3.6 - returns 1 otherwise
 if {$tk_version == "3.6"} {
     proc tk4 {} {
         return 0
@@ -243,6 +323,19 @@ if {$tk_version == "3.6"} {
     }
 }
 
+# The following two procedures deals with menu entries. The interface
+# changed from Tk 3.6 to 4.X
+
+# Procedure configure-enable-e {w n}
+#  w   is a menu
+#  n   menu entry number (0 is first entry)
+# Enables menu entry
+
+# Procedure configure-disable-e {w n}
+#  w   is a menu
+#  n   menu entry number (0 is first entry)
+# Disables menu entry
+
 if {[tk4]} {
     proc configure-enable-e {w n} {
         incr n
@@ -263,6 +356,8 @@ if {[tk4]} {
     set noFocus {}
 }
 
+# Set monoFlag to 1 if screen is known not to support colors; otherwise
+#  set monoFlag to 0
 if {![tk4]} {
     if {[tk colormodel .] == "color"} {
         set monoFlag 0
@@ -273,10 +368,18 @@ if {![tk4]} {
     set monoFlag 0
 }
 
+# Define libdir to the IrTcl configuration directory.
+# In the line below LIBDIR will be modified during 'make install'.
 set libdir LIBDIR
+
+# If the bitmaps sub directory is present with a bitmap we assume 
+# the client is run from the source directory in which case we
+# set libdir the current directory.
 if {[file readable bitmaps/book2]} {
     set libdir .
 }
+
+# Make a final check to see if libdir was set ok.
 if {! [file readable ${libdir}/bitmaps/book2]} {
     puts "Cannot locate system files in ${libdir}. You must either run this"
     puts "program from the source directory root of ir-tcl or you must assure"
@@ -284,23 +387,25 @@ if {! [file readable ${libdir}/bitmaps/book2]} {
     exit 1
 }
 
+# Initialize a lot of globals.
 set hotTargets {}
 set hotInfo {}
 set busy 0
 
-set profile(Default) {{} {} {210} {} 16384 8192 tcpip {} 1 {} {} Z39 1}
+set profile(Default) {{} {} {210} {} 50000 30000 tcpip {} 1 {} {} Z39 1 2 0 0 4}
 set hostid Default
 set settingsChanged 0
 set setNo 0
 set setNoLast 0
 set cancelFlag 0
 set scanEnable 0
-set fullMarcSeq 0
 set displayFormat 1
 set popupMarcdf 0
 set textWrap word
 set recordSyntax None
+set elementSetNames None
 set delayRequest {}
+set debugMode 0
 
 set queryTypes {Simple}
 set queryButtons { { {I 0} {I 1} {I 2} } }
@@ -311,6 +416,9 @@ wm minsize . 0 0
 set setOffset 0
 set setMax 0
 
+# Procedure tkerror {err}
+#   err   error message
+# Override the Tk error handler function.
 proc tkerror err {
     set w .tkerrorw
 
@@ -331,23 +439,49 @@ proc tkerror err {
     bottom-buttons $w [list {Close} [list destroy $w]] 1
 }
 
+# Read the global configuration file.
+if {[file readable "clientrc.tcl"]} {
+    source "clientrc.tcl"
+} else {
+    if {[file readable "${libdir}/clientrc.tcl"]} {
+        source "${libdir}/clientrc.tcl"
+    }
+}
+
+# Read the user configuration file.
+if {[file readable "~/.clientrc.tcl"]} {
+    source "~/.clientrc.tcl"
+}
+
+# These globals describe the current query type. They are set to the
+# first query type.
+set queryButtonsFind [lindex $queryButtons 0]
+set queryInfoFind [lindex $queryInfo 0]
+
+# Procedure read-formats
+# Read all Tcl source files in the subdirectory 'formats'.
+# The name of each source will correspond to a display format.
 proc read-formats {} {
     global displayFormats
     global libdir
-    if {[catch {set formats [glob -nocomplain ${libdir}/formats/*.tcl]}]} {
-        set formats ./formats/raw.tcl
-    }
+
+    set oldDir [pwd]
+    cd ${libdir}/formats
+    set formats [glob {*.[tT][cC][lL]}]
     foreach f $formats {
 	if {[file readable $f]} {
             source $f
             set l [string length $f]
-            set f [string range $f [string length "${libdir}/formats/"] \
-                    [expr $l - 5]]
+            set f [string tolower [string range $f 0 [expr $l - 5]]]
             lappend displayFormats $f
         }
     }
+    cd $oldDir
 }
 
+# Procedure set-wrap {m}
+#  m    boolean wrap mode
+# Handler to enable/disable text wrap in the main record window
 proc set-wrap {m} {
     global textWrap
 
@@ -355,9 +489,60 @@ proc set-wrap {m} {
     .data.record configure -wrap $m
 }
 
+# Procedure dputs {m}
+#  m    string to be printed
+# puts utility for debugging.
 proc dputs {m} {
+    global debugMode
+    if {$debugMode} {
+        puts $m
+    }
+}
+
+# Procedure apduDump {}
+# Logs BER dump of last APDU in window if debugMode is true.
+proc apduDump {} {
+    global debugMode
+
+    set w .apdu
+
+    if {$debugMode == 0} return
+    set x [z39 apduInfo]
+
+    set offset [lindex $x 1]
+    set length [lindex $x 0]
+
+    if {![winfo exists $w]} {
+        catch {destroy $w}
+        toplevelG $w
+
+        wm title $w "APDU information" 
+        
+        wm minsize $w 0 0
+        
+        top-down-window $w
+        
+        text $w.top.t -font fixed -width 60 -height 12 -wrap word \
+		-relief flat -borderwidth 0 -yscrollcommand [list $w.top.s set]
+        scrollbar $w.top.s -command [list $w.top.t yview]
+        
+        pack $w.top.s -side right -fill y
+        pack $w.top.t -expand yes -fill both
+
+        bottom-buttons $w [list {Close} [list destroy $w]] 0
+    }
+    $w.top.t insert end "Length: ${length}\n"
+    if {$offset != -1} {
+        $w.top.t insert end "Offset: ${offset}\n"
+    }
+    $w.top.t insert end [lindex $x 2]
+    $w.top.t insert end "---------------------------------\n"
+
 }
 
+# Procedure set-display-format {f}
+#  f    display format
+# Reformats main record window to use display format given by f
 proc set-display-format {f} {
     global displayFormat
     global setNo
@@ -374,6 +559,8 @@ proc set-display-format {f} {
     add-title-lines -1 10000 1
 }
 
+# Procedure initBindings
+# Disables various default bindings for Text and Listbox widgets.
 proc initBindings {} {
     set w Text
     bind $w <1> {}
@@ -399,6 +586,10 @@ proc initBindings {} {
     set w Entry
 }
 
+# Procedure post-menu {wbutton wmenu}
+#   wbutton    button widget
+#   wmenu      menu widget
+# Post menu near button. Note: not used.
 proc post-menu {wbutton wmenu} {
     $wmenu activate none
     focus $wmenu
@@ -407,10 +598,22 @@ proc post-menu {wbutton wmenu} {
 
 }
 
+# Procedure destroyGW {w}
+#   w     top level widget
+# Saves geometry of widget w in windowGeometry array. This
+# Procedure is used to save current geometry of a window before
+# it is destroyed.
+# See also topLevelG.
 proc destroyGW {w} {
     global windowGeometry
     set windowGeometry($w) [wm geometry $w]
 }    
+
+# Procedure topLevelG
+#   w     top level widget
+# Makes a new top level widget named w; sets geometry of window if it 
+# exists in windowGeometry array. The destroyGW procedure is set 
+# to be called when the Destroy event occurs.
 proc toplevelG {w} {
     global windowGeometry
 
@@ -424,21 +627,9 @@ proc toplevelG {w} {
     bind $w <Destroy> [list destroyGW $w]
 }
 
-if {[file readable "clientrc.tcl"]} {
-    source "clientrc.tcl"
-} else {
-    if {[file readable "${libdir}/clientrc.tcl"]} {
-        source "${libdir}/clientrc.tcl"
-    }
-}
-
-if {[file readable "~/.clientrc.tcl"]} {
-    source "~/.clientrc.tcl"
-}
-
-set queryButtonsFind [lindex $queryButtons 0]
-set queryInfoFind [lindex $queryInfo 0]
-
+# Procedure top-down-window {w}
+#  w    window (possibly top level)
+# Makes two frames inside w called top and bot.
 proc top-down-window {w} {
     frame $w.top -relief raised -border 1
     frame $w.bot -relief raised -border 1
@@ -447,13 +638,21 @@ proc top-down-window {w} {
     pack  $w.bot -fill both
 }
 
+# Procedure top-down-ok-cancel {w ok-action g}
+#  w          top level widget with $w.bot-frame
+#  ok-action  ok script
+#  g          grab flag
+# Makes two buttons in the bot frame called Ok and Cancel. The
+# ok-action is executed if Ok is pressed. If Cancel is activated
+# The window is destroyed. If g is true a grab is performed on the
+# window and the procedure waits until the window is destroyed.
 proc top-down-ok-cancel {w ok-action g} {
     frame $w.bot.left -relief sunken -border 1
-    pack $w.bot.left -side left -expand yes -ipadx 2 -ipady 2 -padx 4 -pady 4
-    button $w.bot.left.ok -width 5 -text {Ok} \
+    pack $w.bot.left -side left -expand yes -ipadx 2 -ipady 2 -padx 1 -pady 1
+    button $w.bot.left.ok -width 4 -text {Ok} \
             -command ${ok-action}
-    pack $w.bot.left.ok -expand yes -ipadx 2 -ipady 2 -padx 3 -pady 3
-    button $w.bot.cancel -width 6 -text {Cancel} \
+    pack $w.bot.left.ok -expand yes -ipadx 1 -ipady 1 -padx 2 -pady 2
+    button $w.bot.cancel -width 5 -text {Cancel} \
             -command [list destroy $w]
     pack $w.bot.cancel -side left -expand yes    
 
@@ -463,21 +662,30 @@ proc top-down-ok-cancel {w ok-action g} {
     }
 }
 
+# Procedure bottom-buttons {w buttonList g}
+#  w          top level widget with $w.bot-frame
+#  buttonList button specifications
+#  g          grab flag
+# Makes a list of buttons in the $w.bot frame. The buttonList is a list 
+# of button specifications. Each button specification consists of two
+# items; the first item is button label name; the second item is a script
+# of be executed when that button is executed. A grab is performed if g 
+# is true and it waits for the window to be destroyed.
 proc bottom-buttons {w buttonList g} {
     set i 0
     set l [llength $buttonList]
 
     frame $w.bot.$i -relief sunken -border 1
-    pack $w.bot.$i -side left -expand yes -padx 4 -pady 4
+    pack $w.bot.$i -side left -expand yes -padx 2 -pady 2
     button $w.bot.$i.ok -text [lindex $buttonList $i] \
             -command [lindex $buttonList [expr $i+1]]
-    pack $w.bot.$i.ok -expand yes -ipadx 2 -ipady 2 -padx 2 -pady 2 -side left
+    pack $w.bot.$i.ok -expand yes -padx 2 -pady 2 -side left
 
     incr i 2
     while {$i < $l} {
         button $w.bot.$i -text [lindex $buttonList $i] \
                 -command [lindex $buttonList [expr $i+1]]
-        pack $w.bot.$i -expand yes -ipadx 2 -ipady 2 -padx 2 -pady 2 -side left
+        pack $w.bot.$i -expand yes -padx 2 -pady 2 -side left
         incr i 2
     }
     if {$g} {
@@ -487,6 +695,12 @@ proc bottom-buttons {w buttonList g} {
     }
 }
 
+# Procedure cancel-operation
+# This handler is invoked when the user wishes to cancel an operation.
+# If the system is currently busy a "Cancel" will be displayed in the
+# status area and the cancelFlag is set to true indicating that future
+# responses from the target should be ignored. The system is no longer
+# when this procedure exists.
 proc cancel-operation {} {
     global cancelFlag
     global busy
@@ -499,6 +713,10 @@ proc cancel-operation {} {
     }
 }
 
+# Procedure show-target {target base}
+#  target     name of target
+#  base       name of database
+# Displays target name and database name in the target status area.
 proc show-target {target base} {
     global profile
 
@@ -513,6 +731,12 @@ proc show-target {target base} {
     }
 }
 
+# Procedure show-logo {v1}
+#  v1    integer level
+# This procedure maintains the book logo in the bottom of the screen.
+# It is invoked only once during initialization of windows, etc., and
+# by itself. The global 'busy' variable determines whether the logo is
+# moving or not.
 proc show-logo {v1} {
     global busy
     global libdir
@@ -535,7 +759,14 @@ proc show-logo {v1} {
         }
     }
 }
-        
+
+# Procedure show-status {status b sb}
+#  status     status message string
+#  b          busy indicator
+#  sb         search busy indicator
+# Display status information according to 'status' and sets the global
+# busy flag 'busy' to b if b is non-empty. If sb is non-empty it indicates
+# whether service buttons should be enabled or disabled.
 proc show-status {status b sb} {
     global busy
     global scanEnable
@@ -585,10 +816,19 @@ proc show-status {status b sb} {
     }
 }
 
+# Procedure show-message {msg}
+#  msg    message string
+# Sets message the bottom of the screen to msg.
 proc show-message {msg} {
     .bot.a.message configure -text "$msg"
 }
 
+# Procedure insertWithTags {w text args}
+#  w      text widget
+#  text   string to be inserted
+#  args   list of tags
+# Inserts text at the insertion point in widget w. The text is tagged 
+# with the tags in args.
 proc insertWithTags {w text args} {
     set start [$w index insert]
     $w insert insert $text
@@ -600,6 +840,8 @@ proc insertWithTags {w text args} {
     }
 }
 
+# Procedure popup-license
+# Displays LICENSE information.
 proc popup-license {} {
     global libdir
     set w .popup-licence
@@ -611,8 +853,8 @@ proc popup-license {} {
 
     top-down-window $w
 
-    text $w.top.t -width 80 -height 10 -wrap word \
-        -yscrollcommand [list $w.top.s set]
+    text $w.top.t -width 80 -height 10 -wrap word -relief flat -borderwidth 0 \
+        -font fixed -yscrollcommand [list $w.top.s set]
     scrollbar $w.top.s -command [list $w.top.t yview]
     
     pack $w.top.s -side right -fill y
@@ -629,6 +871,9 @@ proc popup-license {} {
     bottom-buttons $w [list {Close} [list destroy $w]] 1
 }
 
+# Procedure about-target
+# Displays various information about the current target, such
+# as implementation-name, implementation-id, etc.
 proc about-target {} {
     set w .about-target-w
     global hostid
@@ -663,6 +908,9 @@ proc about-target {} {
     bottom-buttons $w [list {Close} [list destroy $w]] 1
 }
 
+# Procedure about-origin-logo {n}
+#   n    integer level
+# Displays book logo in the .about-origin-w widget
 proc about-origin-logo {n} {
     global libdir
     set w .about-origin-w
@@ -677,9 +925,12 @@ proc about-origin-logo {n} {
     after 140 [list about-origin-logo $n]
 }
 
+# Procedure about-origin
+# Display various information about origin (this client).
 proc about-origin {} {
     set w .about-origin-w
     global libdir
+    global tk_version
     
     if {[winfo exists $w]} {
         destroy $w
@@ -700,40 +951,46 @@ proc about-origin {} {
     label $w.top.a.logo -bitmap @${libdir}/bitmaps/book1 
     pack $w.top.a.irtcl $w.top.a.logo -side left -expand yes
 
-    set i [z39 implementationName]
+    set i unknown
+    catch {set i [z39 implementationName]}
     label $w.top.p.in -text "Implementation name: $i"
-    set i [z39 implementationId]
+    catch {set i [z39 implementationId]}
     label $w.top.p.ii -text "Implementation id: $i"
-    set i [z39 implementationVersion]
+    catch {set i [z39 implementationVersion]}
     label $w.top.p.iv -text "Implementation version: $i"
+    set i $tk_version
+    label $w.top.p.tk -text "Tk version: $i"
 
-    pack $w.top.p.in $w.top.p.ii $w.top.p.iv -side top -anchor nw
+    pack $w.top.p.in $w.top.p.ii $w.top.p.iv $w.top.p.tk -side top -anchor nw
 
     about-origin-logo 1
     bottom-buttons $w [list {Close} [list destroy $w] \
                             {License} [list popup-license]] 0
 }
 
+# Procedure popup-marc {sno no b df}
+#  sno     result set number
+#  no      record position number
+#  b       popup window number
+#  df      display format
+# Displays record in set $sno at position $no in window .full-marc$b.
+# The global variable $popupMarcdf holds the current format method.
 proc popup-marc {sno no b df} {
-    global fullMarcSeq
     global displayFormats
     global popupMarcdf
 
     if {[z39.$sno type $no] != "DB"} {
         return
     }
-    if {$b} {
-        set w .full-marc-$fullMarcSeq
-        incr fullMarcSeq
-        set df $popupMarcdf
-    } else {
-        set w .full-marc
-        set df $popupMarcdf
+    if {$b == -1} {
+        set b 0
+        while {[winfo exists .full-marc$b]} {
+            incr b
+        }
     }
-    if {[winfo exists $w]} {
-        set new 0
-    } else {
-
+    set df $popupMarcdf
+    set w .full-marc$b
+    if {![winfo exists $w]} {
         toplevelG $w
 
         wm minsize $w 0 0
@@ -744,8 +1001,8 @@ proc popup-marc {sno no b df} {
         pack  $w.top -side top -fill both -expand yes
         pack  $w.bot -fill both
 
-        text $w.top.record -width 60 -height 5 -wrap word \
-                -yscrollcommand [list $w.top.s set]
+        text $w.top.record -width 60 -height 5 -wrap word -relief flat \
+                -borderwidth 0 -font fixed -yscrollcommand [list $w.top.s set]
         scrollbar $w.top.s -command [list $w.top.record yview]
 
         global monoFlag
@@ -757,53 +1014,74 @@ proc popup-marc {sno no b df} {
             $w.top.record tag configure marc-id -foreground black
         }
         $w.top.record tag configure marc-data -foreground black
-        set new 1
-    }
-    $w.top.record delete 0.0 end
-    set recordType [z39.$sno recordType $no]
-    wm title $w "$recordType record #$no"
+        $w.top.record tag configure marc-head \
+                -font -Adobe-Times-Medium-R-Normal-*-180-* \
+                -background black -foreground white
+
+        $w.top.record tag configure marc-pref \
+                -font -Adobe-Times-Medium-R-Normal-*-180-* \
+                -foreground blue
+        $w.top.record tag configure marc-text \
+                -font -Adobe-Times-Medium-R-Normal-*-180-* \
+                -foreground black
+        $w.top.record tag configure marc-it \
+                -font -Adobe-Times-Medium-I-Normal-*-180-* \
+                -foreground black
 
-    if {$new} {
-        bind $w.top.record <Return> {destroy .full-marc}
-        
         pack $w.top.s -side right -fill y
         pack $w.top.record -expand yes -fill both
         
-        if {$b} {
-            bottom-buttons $w [list \
-                {Close} [list destroy $w]] 0
-        } else {
-            bottom-buttons $w [list \
-                    {Close} [list destroy $w] \
-                    {Duplicate} [list popup-marc $sno $no 1 0]] 0
-            menubutton $w.bot.formats -text "Format" -menu $w.bot.formats.m
-            menu $w.bot.formats.m
-            set i 0
-            foreach f $displayFormats {
-                $w.bot.formats.m add radiobutton -label $f \
-                        -variable popupMarcdf -value $i \
-                        -command [list display-$f $sno $no $w.top.record 0]
-                incr i
-            }
-            pack $w.bot.formats -expand yes -ipadx 2 -ipady 2 \
-                    -padx 3 -pady 3 -side left
-        }
+        bottom-buttons $w [list \
+                {Close} [list destroy $w] \
+                {Prev} {} \
+                {Next} {} \
+                {Duplicate} {}] 0
+        menubutton $w.bot.formats -text "Format" -menu $w.bot.formats.m \
+                -relief raised
+        menu $w.bot.formats.m
+        pack $w.bot.formats -expand yes -ipadx 2 -ipady 2 \
+                -padx 3 -pady 3 -side left
     } else {
-        set i 0
         $w.bot.formats.m delete 0 last
-        foreach f $displayFormats {
-            $w.bot.formats.m add radiobutton -label $f \
-                    -variable popupMarcdf -value $i \
-                    -command [list display-$f $sno $no $w.top.record 0]
-            incr i
-        }
     }
+    set i 0
+    foreach f $displayFormats {
+        $w.bot.formats.m add radiobutton -label $f \
+                -variable popupMarcdf -value $i \
+                -command [list popup-marc $sno $no $b 0]
+        incr i
+    }
+    $w.top.record delete 0.0 end
+    set recordType [z39.$sno recordType $no]
+    wm title $w "$recordType record #$no"
+
+    $w.bot.2 configure -command \
+            [list popup-marc $sno [expr $no-1] $b $df]
+    $w.bot.4 configure -command \
+            [list popup-marc $sno [expr $no+1] $b $df]
+    if {$no == 1} {
+        $w.bot.2 configure -state disabled
+    } else {
+        $w.bot.2 configure -state normal
+    }
+    if {[z39.$sno type [expr $no+1]] != "DB"} {
+        $w.bot.4 configure -state disabled
+    } else {
+        $w.bot.4 configure -state normal
+    }
+    $w.bot.6 configure -command [list popup-marc $sno $no -1 0]
     set ffunc [lindex $displayFormats $df]
     set ffunc "display-$ffunc"
 
     $ffunc $sno $no $w.top.record 0
 }
 
+# Procedure update-target-hotlist {target base}
+#  target     current target name
+#  base       current database name
+# Updates the global $hotTargets so that $target and $base are
+# moved to the front, i.e. they become the number 1 target/base.
+# The target menu is updated by a call to set-target-hotlist.
 proc update-target-hotlist {target base} {
     global hotTargets
 
@@ -820,6 +1098,10 @@ proc update-target-hotlist {target base} {
     set-target-hotlist $olen
 } 
 
+# Procedure delete-target-hotlist {target}
+#  target    target to be deleted
+# Updates the global $hotTargets so that $target is removed.
+# The target menu is updated by a call to set-target-hotlist.
 proc delete-target-hotlist {target} {
     global hotTargets
 
@@ -834,6 +1116,10 @@ proc delete-target-hotlist {target} {
     set-target-hotlist $olen
 }
 
+# Procedure set-target-hotlist {olen}
+#  olen     number of hot target entries to be deleted from menu
+# Updates the target menu with the targets with the first 8 entries
+# in the $hotTargets global.
 proc set-target-hotlist {olen} {
     global hotTargets
    
@@ -862,12 +1148,22 @@ proc set-target-hotlist {olen} {
     }
 }
 
+# Procedure reopen-target {target base}
+#  target    target to be opened
+#  base      base to be used
+# Closes connection with current target and opens a new connection
+# with $target and database $base.
 proc reopen-target {target base} {
     close-target
     open-target $target $base
     update-target-hotlist $target $base
 }
 
+# Procedure define-target-action
+# Prepares the setup of a new target. The name of the target
+# is read from the dialog .target-define dialog (procedure
+# define-target-dialog) and the target definition window is displayed by
+# a call to protocol-setup.
 proc define-target-action {} {
     global profile
     
@@ -877,35 +1173,56 @@ proc define-target-action {} {
     }
     foreach n [array names profile] {
         if {$n == $target} {
+            destroy .target-define
             protocol-setup $n
             return
         }
     }
     set seq [lindex $profile(Default) 12]
     dputs "seq=${seq}"
+    dputs $profile(Default)
     set profile($target) $profile(Default)
     set profile(Default) [lreplace $profile(Default) 12 12 [incr seq]]
-
+   
     protocol-setup $target
     destroy .target-define
 }
 
+# Procedure fail-response {target}
+#  target   current target
+# Error handler (IrTcl failback) that takes care of serious protocol
+# errors, connection lost, etc.
 proc fail-response {target} {
+    global debugMode
+
     set c [lindex [z39 failInfo] 0]
     set m [lindex [z39 failInfo] 1]
+    if {$c == 4 || $c == 5} {
+        set debugMode 1        
+        apduDump
+    }
     close-target
     tkerror "$m ($c)"
 }
 
+# Procedure connect-response {target base}
+#  target   current target
+#  base     current database
+# IrTcl connect response handler.
 proc connect-response {target base} {
     dputs "connect-response"
     show-target $target $base
     init-request
 }
 
+# Procedure open-target {target base}
+#  target   target to be opened
+#  base     database to be used
+# Opens a new connection with $target/$base.
 proc open-target {target base} {
     global profile
     global hostid
+    global presentChunk
 
     z39 disconnect
     z39 comstack [lindex $profile($target) 6]
@@ -923,6 +1240,29 @@ proc open-target {target base} {
     } else {
         z39 databaseNames $base
     }
+    set x [lindex $profile($target) 13]
+    if {$x == ""} {
+        set x 2
+    }
+    z39 largeSetLowerBound $x
+
+    set x [lindex $profile($target) 14]
+    if {$x == ""} {
+        set x 0
+    }
+    z39 smallSetUpperBound $x
+
+    set x [lindex $profile($target) 15]
+    if {$x == ""} {
+        set x 0
+    }
+    z39 mediumSetPresentNumber $x
+
+    set presentChunk [lindex $profile($target) 16]
+    if {$presentChunk == ""} {
+        set presentChunk 4
+    }
+
     z39 failback [list fail-response $target]
     z39 callback [list connect-response $target $base]
     update idletasks
@@ -940,6 +1280,8 @@ proc open-target {target base} {
     configure-enable-e .top.target.m 2
 }
 
+# Procedure close-target
+# Shuts down the connection with current target.
 proc close-target {} {
     global hostid
     global cancelFlag
@@ -967,6 +1309,9 @@ proc close-target {} {
     configure-enable-e .top.target.m 0
 }
 
+# Procedure load-set-action
+# Loads records from a file. The filename is read from the entry
+# .load-set.filename.entry (see function load-set)
 proc load-set-action {} {
     global setNoLast
 
@@ -989,6 +1334,9 @@ proc load-set-action {} {
     show-status Ready 0 {}
 }
 
+# Procedure load-set
+# Dialog that asks for a filename with records to be loaded
+# into a result set.
 proc load-set {} {
     set w .load-set
     toplevel $w
@@ -1007,6 +1355,9 @@ proc load-set {} {
     focus $oldFocus
 }
 
+# Procedure init-request
+# Sends an initialize request to the target. This procedure is called
+# when a connect has been established.
 proc init-request {} {
     global cancelFlag
 
@@ -1023,10 +1374,16 @@ proc init-request {} {
     }
 }
 
+# Procedure init-response
+# Handles and incoming init-response. The service buttons
+# are enabled. The global $scanEnable indicates whether the target
+# supports scan.
 proc init-response {} {
     global cancelFlag
     global scanEnable
 
+    dputs {init-reponse}
+    apduDump
     if {$cancelFlag} {
         close-target
         return
@@ -1046,6 +1403,12 @@ proc init-response {} {
     }
 }
 
+# Procedure search-request
+#  bflag     flag to indicate if this procedure calls itself
+# Performs a search. If $busy is 1, the search-request is performed
+# at a later time (when another response arrives). This procedure
+# sets many search-related Z39-settings. The global $setNo is set
+# to the result set number (z39.$setNo).
 proc search-request {bflag} {
     global setNo
     global setNoLast
@@ -1055,9 +1418,13 @@ proc search-request {bflag} {
     global cancelFlag
     global delayRequest
     global recordSyntax
+    global elementSetNames
 
     set target $hostid
 
+    if {[z39 connect] == ""} {
+        return
+    }
     dputs "search-request"
     show-message {}
     if {!$bflag && $busy} {
@@ -1100,11 +1467,25 @@ proc search-request {bflag} {
     } else {
         z39.$setNo preferredRecordSyntax $recordSyntax
     }
+    if {$elementSetNames == "None" } {
+        z39.$setNo elementSetNames {}
+        z39.$setNo smallSetElementSetNames {}
+        z39.$setNo mediumSetElementSetNames {}
+    } else {
+        z39.$setNo elementSetNames $elementSetNames
+        z39.$setNo smallSetElementSetNames $elementSetNames
+        z39.$setNo mediumSetElementSetNames $elementSetNames
+    }
     z39 callback {search-response}
     z39.$setNo search $query
     show-status Searching 1 0
 }
 
+# Procedure scan-copy {y entry}
+#  y       y-position of mouse pointer
+#  entry   a search entry in the top
+# Copies the term in the list nearest $y to the query entry specified
+# by $entry
 proc scan-copy {y entry} {
     set w .scan-window
     set no [$w.top.list nearest $y]
@@ -1113,6 +1494,9 @@ proc scan-copy {y entry} {
     .lines.$entry.e insert 0 [string range [$w.top.list get $no] 8 end]
 }
 
+# Procedure scan-request
+# Performs a scan on term "0" with the current attributes in entry
+# specified by the global $curIndexEntry.
 proc scan-request {} {
     set w .scan-window
 
@@ -1182,6 +1566,11 @@ proc scan-request {} {
     show-status Scanning 1 0
 }
 
+# Procedure scan-term-h {attr} 
+# attr    attribute specification
+# This procedure is called whenever a key is released in the entry in the
+# scan window (.scan-window). A scan is then initiated with the new contents
+# of the entry as the starting term.
 proc scan-term-h {attr} {
     global busy
     global scanTerm
@@ -1207,6 +1596,16 @@ proc scan-term-h {attr} {
     show-status Scanning 1 0
 }
 
+# Procedure scan-response {attr start toget}
+#  attr   attribute specification
+#  start  position of first term in the response
+#  toget  number of total terms to get
+# This procedure handles all scan-responses. $start specifies the list
+# entry number of the first incoming term. The $toget indicates the total
+# number of terms to be retrieved from the target. The $toget may be
+# negative in which case, scan is performed 'backwards' (- $toget is
+# the total number of terms in this case). This procedure usually calls
+# itself several times in order to get small scan-term-list chunks.
 proc scan-response {attr start toget} {
     global cancelFlag
     global delayRequest
@@ -1215,6 +1614,7 @@ proc scan-response {attr start toget} {
 
     set w .scan-window
     dputs "In scan-response"
+    apduDump
     set m [z39.scan numberOfEntriesReturned]
     dputs $m
     dputs attr=$attr
@@ -1316,6 +1716,11 @@ proc scan-response {attr start toget} {
     show-status Ready 0 1
 }
 
+# Procedure scan-down {attr}
+#  attr   attribute specification
+# This procedure is called when the user hits the Down button the scan
+# window. A new scan is initiated with a positive $toget passed to the
+# scan-response handler.
 proc scan-down {attr} {
     global scanView
     global cancelFlag
@@ -1347,6 +1752,11 @@ proc scan-down {attr} {
     $w.top.list yview $scanView
 }
 
+# Procedure scan-up {attr}
+#  attr   attribute specification
+# This procedure is called when the user hits the Up button the scan
+# window. A new scan is initiated with a negative $toget passed to the
+# scan-response handler.
 proc scan-up {attr} {
     global scanView
     global cancelFlag
@@ -1376,6 +1786,13 @@ proc scan-up {attr} {
     $w.top.list yview $scanView
 }
 
+# Procedure search-response
+# This procedure handles search-responses. If the search is successful
+# this procedure will try to retrieve a total of 20 records from the target;
+# however not more than $presentChunk records at a time. This procedure
+# affects the following globals:
+#   $setOffset        current record position offset
+#   $setMax           total number of records to be retrieved
 proc search-response {} {
     global setNo
     global setOffset
@@ -1383,7 +1800,9 @@ proc search-response {} {
     global cancelFlag
     global busy
     global delayRequest
+    global presentChunk
 
+    apduDump
     dputs "In search-response"
     if {$cancelFlag} {
         dputs "Handling cancel"
@@ -1419,11 +1838,31 @@ proc search-response {} {
     if {$setMax > 20} {
         set setMax 20
     }
-    z39 callback {present-response}
-    z39.$setNo present $setOffset 1
-    show-status Retrieving 1 0
+    set no [z39.$setNo numberOfRecordsReturned]
+    dputs "Returned $no records, setOffset $setOffset"
+    add-title-lines $setNo $no $setOffset
+    set setOffset [expr $setOffset + $no]
+
+    set toGet [expr $setMax - $setOffset + 1]
+    if {$toGet > 0} {
+        if {$setOffset == 1} {
+            set toGet 1
+        } elseif {$toGet > $presentChunk} {
+            set toGet $presentChunk
+        }
+        z39 callback {present-response}
+        z39.$setNo present $setOffset $toGet
+        show-status Retrieving 1 0
+    }
 }
 
+# Procedure present-more {number}
+#  number      number of records to be retrieved
+# This procedure starts a present-request. The $number variable indicates
+# the total number of records to be retrieved. The global $presentChunk
+# specifies the number of records to be retrieved at a time. If $number
+# is the empty string all remaining records in the result set are 
+# retrieved.
 proc present-more {number} {
     global setNo
     global setOffset
@@ -1431,6 +1870,7 @@ proc present-more {number} {
     global busy
     global cancelFlag
     global delayRequest
+    global presentChunk
 
     dputs "present-more"
     if {$cancelFlag} {
@@ -1468,27 +1908,33 @@ proc present-more {number} {
     if {$toGet <= 0} {
         return
     }
-    if {$toGet > 3} {
-        set toGet 3
+    if {$toGet > $presentChunk} {
+        set toGet $presentChunk
     } 
     z39.$setNo present $setOffset $toGet
     show-status Retrieving 1 0
 }
 
+# Procedure init-title-lines 
+# Utility that cleans the main record window.
 proc init-title-lines {} {
     .data.record delete 0.0 end
 }
 
-proc title-press {y setno} {
-    show-full-marc $setno [expr 1 + [.data.list nearest $y]] 0
-}
-
+# Procedure add-title-lines {setno no offset}
+#  setno    Set number
+#  no       Number of records
+#  offset   Starting offset
+# This procedure displays the records $offset .. $offset+$no-1 in result
+# set $setno in the main record window by using the display format in the
+# global $displayFormat
 proc add-title-lines {setno no offset} {
     global displayFormats
     global displayFormat
     global setNo
     global busy
 
+    dputs "add-title-lines offset=${offset} no=${no}"
     if {$setno != -1} {
         set setNo $setno
     } else {
@@ -1505,6 +1951,7 @@ proc add-title-lines {setno no offset} {
         set o [expr $i + $offset]
         set type [z39.$setno type $o]
         if {$type == ""} {
+            dputs "no more at $o"
             break
         }
         .data.record tag bind r$o <Any-Enter> {}
@@ -1521,14 +1968,20 @@ proc add-title-lines {setno no offset} {
     }
 }
 
+# Procedure present-response
+# Present-response handler. The incoming records are displayed and a new
+# present request is performed until all records ($setMax) is returned
+# from the target.
 proc present-response {} {
     global setNo
     global setOffset
     global setMax
     global cancelFlag
     global delayRequest
+    global presentChunk
 
     dputs "In present-response"
+    apduDump
     set no [z39.$setNo numberOfRecordsReturned]
     dputs "Returned $no records, setOffset $setOffset"
     add-title-lines $setNo $no $setOffset
@@ -1553,8 +2006,8 @@ proc present-response {} {
     if {$no > 0 && $setOffset <= $setMax} {
         dputs "present-request from ${setOffset}"
         set toGet [expr $setMax - $setOffset + 1]
-        if {$toGet > 3} {
-            set toGet 3
+        if {$toGet > $presentChunk} {
+            set toGet $presentChunk
         }
         z39.$setNo present $setOffset $toGet
     } else {
@@ -1562,6 +2015,9 @@ proc present-response {} {
     }
 }
 
+# Procedure left-cursor {w}
+#  w    entry widget
+# Tries to move the cursor left in entry window $w
 proc left-cursor {w} {
     set i [$w index insert]
     if {$i > 0} {
@@ -1571,6 +2027,9 @@ proc left-cursor {w} {
     dputs left
 }
 
+# Procedure right-cursor {w}
+#  w    entry widget
+# Tries to move the cursor right in entry window $w
 proc right-cursor {w} {
     set i [$w index insert]
     incr i
@@ -1578,6 +2037,12 @@ proc right-cursor {w} {
     $w icursor $i
 }
 
+# Procedure bind-fields {list returnAction escapeAction}
+#  list          list of entry widgets
+#  returnAction  return script
+#  escapeAction  escape script
+# Each widget in list are assigned bindings for <Tab>, <Left>, <Right>,
+# <Return> and <Escape>.
 proc bind-fields {list returnAction escapeAction} {
     set max [expr [llength $list]-1]
     for {set i 0} {$i < $max} {incr i} {
@@ -1602,6 +2067,12 @@ proc bind-fields {list returnAction escapeAction} {
     focus [lindex $list 0]
 }
 
+# Procedure entry-fields {parent list tlist returnAction escapeAction}
+#  list          list of frame widgets
+#  tlist         list of text to be used as lead of each entry
+#  returnAction  return script
+#  escapeAction  escape script
+# Makes label and entry widgets in each widget in $list.
 proc entry-fields {parent list tlist returnAction escapeAction} {
     set alist {}
     set i 0
@@ -1618,6 +2089,8 @@ proc entry-fields {parent list tlist returnAction escapeAction} {
     bind-fields $alist $returnAction $escapeAction
 }
 
+# Procedure define-target-dialog
+# Dialog that asks for new target to be defined.
 proc define-target-dialog {} {
     set w .target-define
 
@@ -1633,15 +2106,16 @@ proc define-target-dialog {} {
     top-down-ok-cancel $w {define-target-action} 1
 }
 
-proc protocol-setup-delete {target} {
+# Procedure protocol-setup-delete
+# This procedure is invoked when the user tries to delete a target
+# definition. If user is sure, the target definition is deleted.
+proc protocol-setup-delete {target w} {
     global profile
     global settingsChanged
 
     set a [alert "Are you sure you want to delete the target \
 definition $target ?"]
     if {$a} {
-        set wno [lindex $profile($target) 12]
-        set w .setup-${wno}
         destroy $w
         unset profile($target)
         set settingsChanged 1
@@ -1650,37 +2124,42 @@ definition $target ?"]
     }
 }
 
-proc protocol-setup-action {target} {
+# Procedure protocol-setup-action {target w}
+# target     target to be defined
+# w          target definition toplevel widget
+# This procedure reads all appropriate globals and makes a new/modified
+# profile for the target. The global array $targetS contains most of the
+# information the user may modify.
+proc protocol-setup-action {target w} {
     global profile
-    global csRadioType
-    global protocolRadioType
     global settingsChanged
-    global RPNCheck
-    global CCLCheck
-    global ResultSetCheck
+    global targetS
 
-    set wno [lindex $profile($target) 12]
-    set w .setup-${wno}
-    
-    set b {}
+    set dataBases {}
     set settingsChanged 1
     set len [$w.top.databases.list size]
     for {set i 0} {$i < $len} {incr i} {
-        lappend b [$w.top.databases.list get $i]
+        lappend dataBases [$w.top.databases.list get $i]
     }
+    set wno [lindex $profile($target) 12]
+
     set profile($target) [list [$w.top.description.entry get] \
             [$w.top.host.entry get] \
             [$w.top.port.entry get] \
             [$w.top.idAuthentication.entry get] \
-            [$w.top.maximumRecordSize.entry get] \
-            [$w.top.preferredMessageSize.entry get] \
-            $csRadioType \
-            $b \
-            $RPNCheck \
-            $CCLCheck \
-            $ResultSetCheck \
-            $protocolRadioType \
-            $wno]
+            $targetS($target,MRS) \
+            $targetS($target,PMS) \
+            $targetS($target,csType) \
+            $dataBases \
+            $targetS($target,RPN) \
+            $targetS($target,CCL) \
+            $targetS($target,ResultSets) \
+            $targetS($target,protocolType) \
+            $wno \
+            $targetS($target,LSLB) \
+            $targetS($target,SSUB) \
+            $targetS($target,MSPN) \
+            $targetS($target,presentChunk) ]
 
     cascade-target-list
     delete-target-hotlist $target
@@ -1688,6 +2167,10 @@ proc protocol-setup-action {target} {
     destroy $w
 }
 
+# Procedure place-force {window parent}
+#  window      new top level widget
+#  parent      parent widget used as base
+# Sets geometry of $window relative to $parent window.
 proc place-force {window parent} {
     set g [wm geometry $parent]
 
@@ -1699,26 +2182,31 @@ proc place-force {window parent} {
     wm geometry $window +${x}+${y}
 }
 
-proc add-database-action {target} {
+# Procedure add-database-action {target w}
+#  target      target to be defined
+#  w           top level widget for the target definition
+# Adds the contents of .database-select.top.database.entry to list of
+# databases.
+proc add-database-action {target w} {
     global profile
 
-    set wno [lindex $profile($target) 12]
-    set w .setup-${wno}
-
     $w.top.databases.list insert end \
             [.database-select.top.database.entry get]
     destroy .database-select
 }
 
-proc add-database {target} {
+# Procedure add-database {target wp}
+#  target      target to be defined
+#  wp          top level widget for the target definition
+# Makes a dialog in which the user enters new database
+proc add-database {target wp} {
     global profile
 
     set w .database-select
     toplevel $w
     set oldFocus [focus]
  
-    set wno [lindex $profile($target) 12]
-    place-force $w .setup-${wno}
+    place-force $w $wp
 
     top-down-window $w
 
@@ -1728,17 +2216,20 @@ proc add-database {target} {
     
     entry-fields $w.top {database} \
             {{Database to add:}} \
-            [list add-database-action $target] {destroy .database-select}
+            [list add-database-action $target $wp] {destroy .database-select}
 
-    top-down-ok-cancel $w [list add-database-action $target] 1
+    top-down-ok-cancel $w [list add-database-action $target $wp] 1
     focus $oldFocus
 }
 
-proc delete-database {target} {
+# Procedure delete-database {target w}
+#  target     target to be defined
+#  w          top level widget for the target definition
+# Asks the user if he/she really wishes to delete a database and removes
+# the database from the database-list if requested.
+proc delete-database {target w} {
     global profile
 
-    set wno [lindex $profile($target) 12]
-    set w .setup-${wno}
     set l {}
     foreach i [$w.top.databases.list curselection] {
         set b [$w.top.databases.list get $i]
@@ -1753,16 +2244,20 @@ proc delete-database {target} {
     }
 }
 
+# Procedure protocol-setup {target}
+#  target     target to be defined
+# Makes a dialog in which the user may modify/view a target definition
+# (profile). The $targetS - array holds the initial definition of the
+# target.
 proc protocol-setup {target} {
     global profile
-    global csRadioType
-    global protocolRadioType
-    global RPNCheck
-    global CCLCheck
-    global ResultSetCheck
-
-    set wno [lindex $profile($target) 12]
-    set w .setup-${wno}
+    global targetS
+    
+    set bno 0
+    while {[winfo exists .setup-$bno]} {
+        incr bno
+    }
+    set w .setup-$bno
 
     toplevelG $w
 
@@ -1780,8 +2275,6 @@ proc protocol-setup {target} {
     frame $w.top.host
     frame $w.top.port
     frame $w.top.idAuthentication
-    frame $w.top.maximumRecordSize
-    frame $w.top.preferredMessageSize
     frame $w.top.cs-type -relief ridge -border 2
     frame $w.top.protocol -relief ridge -border 2
     frame $w.top.query -relief ridge -border 2
@@ -1789,49 +2282,48 @@ proc protocol-setup {target} {
 
     # Maximum/preferred/idAuth ...
     pack $w.top.description $w.top.host $w.top.port \
-            $w.top.idAuthentication $w.top.maximumRecordSize \
-            $w.top.preferredMessageSize -side top -anchor e -pady 2
+            $w.top.idAuthentication -side top -anchor e -pady 2
     
-    entry-fields $w.top {description host port idAuthentication \
-            maximumRecordSize preferredMessageSize} \
-            {{Description:} {Host:} {Port:} {Id Authentication:} \
-            {Maximum Record Size:} {Preferred Message Size:}} \
-            [list protocol-setup-action $target] [list destroy $w]
+    entry-fields $w.top {description host port idAuthentication } \
+            {{Description:} {Host:} {Port:} {Id Authentication:}} \
+            [list protocol-setup-action $target $w] [list destroy $w]
     
-    foreach sub {description host port idAuthentication \
-            maximumRecordSize preferredMessageSize} {
+    foreach sub {description host port idAuthentication} {
         dputs $sub
-        bind $w.top.$sub.entry <Control-a> [list add-database $target]
-        bind $w.top.$sub.entry <Control-d> [list delete-database $target]
+        bind $w.top.$sub.entry <Control-a> [list add-database $target $w]
+        bind $w.top.$sub.entry <Control-d> [list delete-database $target $w]
     }
     $w.top.description.entry insert 0 [lindex $profile($target) 0]
     $w.top.host.entry insert 0 [lindex $profile($target) 1]
     $w.top.port.entry insert 0 [lindex $profile($target) 2]
     $w.top.idAuthentication.entry insert 0 [lindex $profile($target) 3]
-    $w.top.maximumRecordSize.entry insert 0 [lindex $profile($target) 4]
-    $w.top.preferredMessageSize.entry insert 0 [lindex $profile($target) 5]
-    set csRadioType [lindex $profile($target) 6]
-    set RPNCheck [lindex $profile($target) 8]
-    set CCLCheck [lindex $profile($target) 9]
-    set ResultSetCheck [lindex $profile($target) 10]
-    set protocolRadioType [lindex $profile($target) 11]
-    if {$protocolRadioType == ""} {
-        set protocolRadioType Z39
-    }
-
+    set targetS($target,csType) [lindex $profile($target) 6]
+    set targetS($target,RPN) [lindex $profile($target) 8]
+    set targetS($target,CCL) [lindex $profile($target) 9]
+    set targetS($target,ResultSets) [lindex $profile($target) 10]
+    set targetS($target,protocolType) [lindex $profile($target) 11]
+    if {$targetS($target,protocolType) == ""} {
+        set targetS($target,protocolType) Z39
+    }
+    set targetS($target,LSLB) [lindex $profile($target) 13]
+    set targetS($target,SSUB) [lindex $profile($target) 14]
+    set targetS($target,MSPN) [lindex $profile($target) 15]
+    set targetS($target,presentChunk) [lindex $profile($target) 16]
+    set targetS($target,MRS) [lindex $profile($target) 4]
+    set targetS($target,PMS) [lindex $profile($target) 5]
     # Databases ....
-    pack $w.top.databases -side left -pady 4 -padx 4 -expand yes -fill both
+    pack $w.top.databases -side left -pady 2 -padx 2 -expand yes -fill both
 
     label $w.top.databases.label -text "Databases"
-    button $w.top.databases.add -text "Add" \
-            -command [list add-database $target]
-    button $w.top.databases.delete -text "Delete" \
-            -command [list delete-database $target]
+    button $w.top.databases.add -text Add \
+            -command [list add-database $target $w]
+    button $w.top.databases.delete -text Delete \
+            -command [list delete-database $target $w]
     if {! [tk4]} {
-        listbox $w.top.databases.list -geometry 20x6 \
+        listbox $w.top.databases.list -geometry 14x6 \
                 -yscrollcommand "$w.top.databases.scroll set"
     } else {
-        listbox $w.top.databases.list -width 20 \
+        listbox $w.top.databases.list -width 14 -height 5\
                 -yscrollcommand "$w.top.databases.scroll set"
     }
     scrollbar $w.top.databases.scroll -orient vertical -border 1
@@ -1850,47 +2342,127 @@ proc protocol-setup {target} {
     }
 
     # Transport ...
-    pack $w.top.cs-type -pady 4 -padx 4 -side top -fill x
+    pack $w.top.cs-type -pady 2 -padx 2 -side top -fill x
     
     label $w.top.cs-type.label -text "Transport" 
     radiobutton $w.top.cs-type.tcpip -text "TCP/IP" -anchor w \
-            -variable csRadioType -value tcpip
+            -variable targetS($target,csType) -value tcpip
     radiobutton $w.top.cs-type.mosi -text "MOSI" -anchor w\
-            -variable csRadioType -value mosi
+            -variable targetS($target,csType) -value mosi
     
     pack $w.top.cs-type.label $w.top.cs-type.tcpip $w.top.cs-type.mosi \
-            -padx 4 -side top -fill x
+            -padx 2 -side top -fill x
 
     # Protocol ...
-    pack $w.top.protocol -pady 4 -padx 4 -side top -fill x
+    pack $w.top.protocol -pady 2 -padx 2 -side top -fill x
     
     label $w.top.protocol.label -text "Protocol" 
     radiobutton $w.top.protocol.z39v2 -text "Z39.50" -anchor w \
-            -variable protocolRadioType -value Z39
+            -variable targetS($target,protocolType) -value Z39
     radiobutton $w.top.protocol.sr -text "SR" -anchor w \
-            -variable protocolRadioType -value SR
+            -variable targetS($target,protocolType) -value SR
     
     pack $w.top.protocol.label $w.top.protocol.z39v2 $w.top.protocol.sr \
-            -padx 4 -side top -fill x
+            -padx 2 -side top -fill x
 
     # Query ...
-    pack $w.top.query -pady 4 -padx 4 -side top -fill x
+    pack $w.top.query -pady 2 -padx 2 -side top -fill x
 
     label $w.top.query.label -text "Query support"
-    checkbutton $w.top.query.c1 -text "RPN query" -anchor w -variable RPNCheck
-    checkbutton $w.top.query.c2 -text "CCL query" -anchor w -variable CCLCheck
-    checkbutton $w.top.query.c3 -text "Result sets" -anchor w -variable ResultSetCheck
+    checkbutton $w.top.query.c1 -text "RPN query" -anchor w \
+            -variable targetS($target,RPN)
+    checkbutton $w.top.query.c2 -text "CCL query" -anchor w \
+            -variable targetS($target,CCL)
+    checkbutton $w.top.query.c3 -text "Result sets" -anchor w \
+            -variable targetS($target,ResultSets)
 
     pack $w.top.query.label -side top 
     pack $w.top.query.c1 $w.top.query.c2 $w.top.query.c3 \
-            -padx 4 -side top -fill x
+            -padx 2 -side top -fill x
 
     # Ok-cancel
-    bottom-buttons $w [list {Ok} [list protocol-setup-action $target] \
-            {Delete} [list protocol-setup-delete $target] \
+    bottom-buttons $w [list {Ok} [list protocol-setup-action $target $w] \
+            {Delete} [list protocol-setup-delete $target $w] \
+            {Advanced} [list advanced-setup $target $bno] \
             {Cancel} [list destroy $w]] 0   
 }
 
+# Procedure advanced-setup {target b}
+#  target     target to be defined
+#  b          window number of target top level
+# Makes a dialog in which the user may modify/view advanced settings
+# of a target definition (profile).
+proc advanced-setup {target b} {
+    global profile
+    global targetS
+
+    set w .advanced-setup-$b
+    
+    toplevelG $w
+    
+    wm title $w "Advanced setup $target"
+    
+    top-down-window $w
+    
+    if {$target == ""} {
+        set target Default
+    }
+    dputs target
+    
+    frame $w.top.largeSetLowerBound
+    frame $w.top.smallSetUpperBound
+    frame $w.top.mediumSetPresentNumber
+    frame $w.top.presentChunk
+    frame $w.top.maximumRecordSize
+    frame $w.top.preferredMessageSize
+
+    pack $w.top.largeSetLowerBound $w.top.smallSetUpperBound \
+            $w.top.mediumSetPresentNumber $w.top.presentChunk \
+            $w.top.maximumRecordSize $w.top.preferredMessageSize \
+            -side top -anchor e -pady 2
+    
+    entry-fields $w.top {largeSetLowerBound smallSetUpperBound \
+            mediumSetPresentNumber presentChunk maximumRecordSize \
+            preferredMessageSize} \
+            {{Large Set Lower Bound:} {Small Set Upper Bound:} \
+            {Medium Set Present Number:} {Present Chunk:} \
+            {Maximum Record Size:} {Preferred Message Size:}} \
+            [list advanced-setup-action $target $b] [list destroy $w]
+
+    $w.top.largeSetLowerBound.entry insert 0 $targetS($target,LSLB)
+    $w.top.smallSetUpperBound.entry insert 0 $targetS($target,SSUB)
+    $w.top.mediumSetPresentNumber.entry insert 0 $targetS($target,MSPN)
+    $w.top.presentChunk.entry insert 0 $targetS($target,presentChunk)
+    $w.top.maximumRecordSize.entry insert 0 $targetS($target,MRS)
+    $w.top.preferredMessageSize.entry insert 0 $targetS($target,PMS)
+    
+    bottom-buttons $w [list {Ok} [list advanced-setup-action $target $b] \
+            {Cancel} [list destroy $w]] 0   
+}
+
+# Procedure advanced-setup-action {target b}
+#  target     target to be defined
+#  b          window number of target top level
+# This procedure is called when the user hits Ok in the advanced target
+# setup dialog. The temporary result is stored in the $targetS - array.
+proc advanced-setup-action {target b} {
+    set w .advanced-setup-$b
+    global targetS
+    
+    set targetS($target,LSLB) [$w.top.largeSetLowerBound.entry get]
+    set targetS($target,SSUB) [$w.top.smallSetUpperBound.entry get]
+    set targetS($target,MSPN) [$w.top.mediumSetPresentNumber.entry get]
+    set targetS($target,presentChunk) [$w.top.presentChunk.entry get]
+    set targetS($target,MRS) [$w.top.maximumRecordSize.entry get]
+    set targetS($target,PMS) [$w.top.preferredMessageSize.entry get]
+
+    dputs "advanced-setup-action"
+    destroy $w
+}
+
+# Procedure database-select-action
+# Called when the user commits a database select change. See procedure
+# database-select.
 proc database-select-action {} {
     set w .database-select.top
     set b {}
@@ -1903,6 +2475,8 @@ proc database-select-action {} {
     destroy .database-select
 }
 
+# Procedure database-select
+# Makes a dialog in which the user may select a database
 proc database-select {} {
     set w .database-select
     global profile
@@ -1937,6 +2511,10 @@ proc database-select {} {
     focus $oldFocus
 }
 
+# Procedure cascade-target-list
+# Makes all target/databases available in the Target|Connect
+# menu as well as all targets in the Target|Setup menu.
+# This procedure is called whenever target definitions occur.
 proc cascade-target-list {} {
     global profile
     
@@ -1963,13 +2541,16 @@ proc cascade-target-list {} {
     }
     .top.target.m.slist delete 0 last
     foreach n [lsort [array names profile]] {
-        if {$n != "Default"} {
-            .top.target.m.slist add command -label $n \
-                    -command [list protocol-setup $n]
-        }
+        .top.target.m.slist add command -label $n \
+                -command [list protocol-setup $n]
     }
 }
 
+# Procedure query-select {i}
+#  i       Query type number (integer)
+# This procedure is called when the user selects a Query type. The current
+# query type information given by the globals $queryButtonsFind and
+# $queryInfoFind are affected by this operation.
 proc query-select {i} {
     global queryButtonsFind
     global queryInfoFind
@@ -1982,6 +2563,9 @@ proc query-select {i} {
     index-lines .lines 1 $queryButtonsFind $queryInfoFind activate-index
 }
 
+# Procedure query-new-action 
+# Commits a new query type definition by extending the globals
+# $queryTypes, $queryButtons and $queryInfo.
 proc query-new-action {} {
     global queryTypes
     global queryButtons
@@ -1997,6 +2581,9 @@ proc query-new-action {} {
     cascade-query-list
 }
 
+# Procedure query-new
+# Makes a dialog in which the user is requested to enter the name of a
+# new query type.
 proc query-new {} {
     set w .query-new
 
@@ -2014,6 +2601,9 @@ proc query-new {} {
     focus $oldFocus
 }
 
+# Procedure query-delete-action {queryNo}
+#  queryNo     query type number (integer)
+# Procedure that deletes the query type specified by $queryNo.
 proc query-delete-action {queryNo} {
     global queryTypes
     global queryButtons
@@ -2029,6 +2619,10 @@ proc query-delete-action {queryNo} {
     cascade-query-list
 }
 
+# Procedure query-delete {queryNo}
+#  queryNo     query type number (integer)
+# Asks if the user really want to delete a given query type; calls
+# query-delete-action if 'yes'.
 proc query-delete {queryNo} {
     global queryTypes
 
@@ -2047,6 +2641,8 @@ query type $n ?"  -aspect 300
                             {Cancel} [list destroy $w]] 1
 }
 
+# Procedure cascade-query-list
+# Updates the enties below Options|Query to list all query types.
 proc cascade-query-list {} {
     global queryTypes
     set w .top.options.m.query
@@ -2072,6 +2668,11 @@ proc cascade-query-list {} {
     }
 }
 
+# Procedure save-geometry
+# This procedure saves the per-user related settings in ~/.clientrc.tcl.
+# The geometry information stored in the global array $windowGeometry is
+# saved. Also a few other user settings, such as current display format, are
+# saved.
 proc save-geometry {} {
     global windowGeometry
     global hotTargets
@@ -2079,16 +2680,25 @@ proc save-geometry {} {
     global displayFormat
     global popupMarcdf
     global recordSyntax
-    
-    set windowGeometry(.) [wm geometry .]
+    global elementSetNames
+    global hostid
 
-    set f [open "~/.clientrc.tcl" w]
+    set windowGeometry(.) [wm geometry .]
 
+    if {[catch {set f [open ~/.clientrc.tcl w]}]} {
+        return
+    } 
+    if {$hostid != "Default"} {
+        puts $f "set hostid \{$hostid\}"
+        set b [z39 databaseNames]
+        puts $f "set hostbase $b"
+    }
     puts $f "set hotTargets \{ $hotTargets \}"
     puts $f "set textWrap $textWrap"
     puts $f "set displayFormat $displayFormat"
     puts $f "set popupMarcdf $popupMarcdf"
     puts $f "set recordSyntax $recordSyntax"
+    puts $f "set elementSetNames $elementSetNames"
     foreach n [array names windowGeometry] {
         puts -nonewline $f "set \{windowGeometry($n)\} \{"
         puts -nonewline $f $windowGeometry($n)
@@ -2097,6 +2707,10 @@ proc save-geometry {} {
     close $f
 }
 
+# Procedure save-settings
+# This procedure saves the per-host related settings clientrc.tcl which
+# is normally kept in the directory /usr/local/lib/irtcl.
+# All query types and target defintion profiles are saved.
 proc save-settings {} {
     global profile
     global libdir
@@ -2137,6 +2751,11 @@ proc save-settings {} {
     set settingsChanged 0
 }
 
+# Procedure alert {ask}
+#  ask    prompt string
+# Makes a grabbed dialog in which the user is requested to answer
+# "Ok" or "Cancel". This procedure returns 1 if the user hits "Ok"; 0
+# otherwise.
 proc alert {ask} {
     set w .alert
 
@@ -2159,12 +2778,17 @@ proc alert {ask} {
     return $alertAnswer
 }
 
+# Procedure alert-action
+# Called when the user hits "Ok" in the .alert-window.
 proc alert-action {} {
     global alertAnswer
     set alertAnswer 1
     destroy .alert
 }
 
+# Procedure exit-action
+# This procedure is called if the user tries to exit without saving the
+# system settings.
 proc exit-action {} {
     global settingsChanged
 
@@ -2178,11 +2802,28 @@ proc exit-action {} {
     exit 0
 }
 
+# Procedure listbuttonaction {w name h user i}
+#  w       menubutton widget
+#  name    name information
+#  h       handler to be invoked
+#  user    user information to be passed to handler $h
+#  i       index passed as second argument to handler $h
+# Utility function to emulate a listbutton. Called when the user
+# Modifies the listbutton. See procedure listbuttonx.
 proc listbuttonaction {w name h user i} {
     $w configure -text [lindex $name 0]
     $h [lindex $name 1] $user $i
 }
-    
+
+# Procedure listbuttonx {button no names handle user}
+#  button  menubutton widget
+#  no      initial value index (integer)
+#  names   list of name entries. The first entry in each name
+#          entry is the actual name
+#  handle  user function to be called when the listbutton changes
+#          its value
+#  user    user argument to the $handle function
+# Makes an extended listbutton.
 proc listbuttonx {button no names handle user} {
     if {[winfo exists $button]} {
         $button configure -text [lindex [lindex $names $no] 0]
@@ -2191,6 +2832,9 @@ proc listbuttonx {button no names handle user} {
         menubutton $button -text [lindex [lindex $names $no] 0] \
                 -width 10 -menu ${button}.m -relief raised -border 1
         menu ${button}.m
+        if {[tk4]} {
+            ${button}.m configure -tearoff off
+	}
     }
     set i 0
     foreach name $names {
@@ -2201,16 +2845,31 @@ proc listbuttonx {button no names handle user} {
     }
 }
 
+# Procedure listbutton {button no names}
+#  button  menubutton widget
+#  no      initial value index (integer)
+#  names   list of possible values.
+# Makes a listbutton. The functionality is emulated by the use menubutton-
+# and menu widgets.
 proc listbutton {button no names} {
     menubutton $button -text [lindex $names $no] -width 10 -menu ${button}.m \
             -relief raised -border 1
     menu ${button}.m
+    if {[tk4]} {
+        ${button}.m configure -tearoff off
+    }
     foreach name $names {
         ${button}.m add command -label $name \
                 -command [list ${button} configure -text $name]
     }
 }
 
+# Procedure listbuttonv-action {button var names i}
+#  button   menubutton widget
+#  var      global variable to be affected
+#  names    list of possible names and values
+# This procedure is called when the user alters a menu created by the
+# listbuttonv procedure. The global variable $var is updated.
 proc listbuttonv-action {button var names i} {
     global $var
 
@@ -2218,6 +2877,13 @@ proc listbuttonv-action {button var names i} {
     $button configure -text [lindex $names $i]
 }
 
+# Procedure listbuttonv {button var names}
+#  button   menubutton widget
+#  var      global variable to be affected
+#  names    List of name/value pairs, i.e. {n1 v1 n2 v2 ...}.
+# This procedure emulates a listbutton by means of menu/menubutton widgets.
+# The global variable $var is automatically updated and set to one of the
+# values v1, v2, ...
 proc listbuttonv {button var names} {
     global $var
 
@@ -2238,12 +2904,18 @@ proc listbuttonv {button var names} {
     menubutton $button -text $n -menu ${button}.m \
             -relief raised -border 1
     menu ${button}.m
+    if {[tk4]} {
+        ${button}.m configure -tearoff off
+    }
     for {set i 0} {$i < $l} {incr i 2} {
         ${button}.m add command -label [lindex $names $i] \
                 -command [list listbuttonv-action $button $var $names $i]
     }
 }
 
+# Procedure query-add-index-action {queryNo}
+#  queryNo       query type number (integer)
+# Handler that makes a new query index.
 proc query-add-index-action {queryNo} {
     set w .query-setup
 
@@ -2260,6 +2932,9 @@ proc query-add-index-action {queryNo} {
     #pack $w.top.lines -side left -pady 6 -padx 6 -fill y
 }
 
+# Procedure query-add-line
+#  queryNo      query type number (integer)
+# Handler that adds new query line.
 proc query-add-line {queryNo} {
     set w .query-setup
 
@@ -2274,6 +2949,9 @@ proc query-add-line {queryNo} {
     #pack $w.top.lines -side left -pady 6 -padx 6 -fill y
 }
 
+# Procedure query-del-line
+#  queryNo      query type number (integer)
+# Handler that removes query line.
 proc query-del-line {queryNo} {
     set w .query-setup
 
@@ -2289,6 +2967,9 @@ proc query-del-line {queryNo} {
     index-lines $w.top.lines 0 $queryButtonsTmp $queryInfoTmp activate-e-index
 }
 
+# Procedure query-add-index
+#  queryNo      query type number (integer)
+# Handler that adds new query index.
 proc query-add-index {queryNo} {
     set w .query-add-index
 
@@ -2306,6 +2987,11 @@ proc query-add-index {queryNo} {
     focus $oldFocus
 }
 
+# Procedure query-setup-action
+#  queryNo      query type number (integer)
+# Handler that updates the query information database stored in the
+# globals $queryInfo and $queryButtons. This procedure is executed when
+# the user commits the query setup changes by pressing button "Ok".
 proc query-setup-action {queryNo} {
     global queryButtons
     global queryInfo
@@ -2329,6 +3015,12 @@ proc query-setup-action {queryNo} {
     index-lines .lines 1 $queryButtonsFind $queryInfoFind activate-index
 }
 
+# Procedure activate-e-index {value no i}
+#   value   menu name
+#   no      query index number
+#   i       menu index (integer)
+# Procedure called when listbutton is activated in the query type edit
+# window. The global $queryButtonsTmp is updated in this operation.
 proc activate-e-index {value no i} {
     global queryButtonsTmp
     global queryIndexTmp
@@ -2338,6 +3030,12 @@ proc activate-e-index {value no i} {
     set queryIndexTmp $i
 }
 
+# Procedure activate-index {value no i}
+#   value   menu name
+#   no      query index number
+#   i       menu index (integer)
+# Procedure called when listbutton is activated in the main query 
+# window. The global $queryButtonsFind is updated in this operation.
 proc activate-index {value no i} {
     global queryButtonsFind
 
@@ -2346,6 +3044,12 @@ proc activate-index {value no i} {
     dputs "queryButtonsFind $queryButtonsFind"
 }
 
+# Procedure update-attr
+# This procedure creates listbuttons for all bib-1 attributes except
+# the use-attribute in the .index-setup window.
+# The globals $relationTmpValue, $positionTmpValue, $structureTmpValue,
+# $truncationTmpValue and $completenessTmpValue are maintainted by the
+# listbuttons.
 proc update-attr {} {
     set w .index-setup
     listbuttonv $w.top.relation.b relationTmpValue\
@@ -2366,6 +3070,12 @@ proc update-attr {} {
             {Incomplete subfield} 1 {Complete subfield} 2 {Complete field} 3}
 }
 
+# Procedure use-attr {init}
+#  init      init flag
+# This procedure creates a listbox with several Bib-1 use attributes.
+# If $init is 1 the listbox is created with the attributes. If $init
+# is 0 the current selection of the listbox is read and the global
+# $useTmpValue is set to the current use-value.
 proc use-attr {init} {
     set attr {
         {None}                           0
@@ -2503,6 +3213,12 @@ proc use-attr {init} {
     }
 }
 
+# Procedure index-setup-action {oldAttr queryNo indexNo}
+#  oldAttr     original attributes (?)
+#  queryNo     query number
+#  indexNo     index number
+# Commits setup of a query index. The mapping from the index to 
+# the Bib-1 attributes are handled by this function.
 proc index-setup-action {oldAttr queryNo indexNo} {
     set attr [lindex $oldAttr 0]
 
@@ -2542,6 +3258,12 @@ proc index-setup-action {oldAttr queryNo indexNo} {
     destroy .index-setup
 }
 
+# Procedure index-setup {attr queryNo indexNo}
+#  attr        original attributes
+#  queryNo     query number
+#  indexNo     index number
+# Makes a window with settings of a given query index which the user
+# may inspect/modify.
 proc index-setup {attr queryNo indexNo} {
     set w .index-setup
 
@@ -2558,6 +3280,14 @@ proc index-setup {attr queryNo indexNo} {
     set completenessTmpValue 0
     set useTmpValue 0
 
+    catch {destroy $w}
+    toplevelG $w
+
+    set n [lindex $attr 0]
+    wm title $w "Index setup $n"
+
+    top-down-window $w
+
     set len [llength $attr]
     for {set i 1} {$i < $len} {incr i} {
         set q [lindex $attr $i]
@@ -2581,15 +3311,6 @@ proc index-setup {attr queryNo indexNo} {
             }
         }
     }
-    if {[winfo exists $w]} {
-        destroy $w
-    }
-    toplevelG $w
-
-    set n [lindex $attr 0]
-    wm title $w "Index setup $n"
-
-    top-down-window $w
 
     frame $w.top.use -relief ridge -border 2
     frame $w.top.relation -relief ridge -border 2
@@ -2665,6 +3386,10 @@ proc index-setup {attr queryNo indexNo} {
 
 }
 
+# Procedure query-edit-index {queryNo}
+#  queryNo     query number
+# Determines if a selection of an index is active. If one is selected
+# the index-setup dialog is started.
 proc query-edit-index {queryNo} {
     global queryInfoTmp
     set w .query-setup
@@ -2678,6 +3403,10 @@ proc query-edit-index {queryNo} {
     index-setup $attr $queryNo $i
 }
 
+# Procedure query-delete-index {queryNo}
+#  queryNo     query number
+# Determines if a selection of an index is active. If one is selected
+# the index is deleted.
 proc query-delete-index {queryNo} {
     global queryInfoTmp
     global queryButtonsTmp
@@ -2692,6 +3421,9 @@ proc query-delete-index {queryNo} {
     $w.top.index.list delete $i
 }
     
+# Procedure query-setup {queryNo}
+#  queryNo     query number
+# Makes a dialog in which a query type an be customized.
 proc query-setup {queryNo} {
     set w .query-setup
 
@@ -2738,7 +3470,7 @@ proc query-setup {queryNo} {
     listbox $w.top.index.list -yscrollcommand [list $w.top.index.scroll set]
     scrollbar $w.top.index.scroll -orient vertical -border 1 \
         -command [list $w.top.index.list yview]
-    bind $w.top.index.list <2> [list query-edit-index $queryNo]
+    bind $w.top.index.list <Double-1> [list query-edit-index $queryNo]
 
     pack $w.top.index.list -side left -fill both -expand yes -padx 2 -pady 2
     pack $w.top.index.scroll -side right -fill y -padx 2 -pady 2
@@ -2754,15 +3486,18 @@ proc query-setup {queryNo} {
     foreach x $queryInfoTmp {
         $w.top.index.list insert end [lindex $x 0]
     }
+
     # Bottom
     bottom-buttons $w [list \
-            {Ok} [list query-setup-action $queryNo] \
-            {Add index} [list query-add-index $queryNo] \
-            {Edit index} [list query-edit-index $queryNo] \
-            {Delete index} [list query-delete-index $queryNo] \
-            {Cancel} [list destroy $w]] 0
+            Ok [list query-setup-action $queryNo] \
+            Add [list query-add-index $queryNo] \
+            Edit [list query-edit-index $queryNo] \
+            Delete [list query-delete-index $queryNo] \
+            Cancel [list destroy $w]] 0
 }
 
+# Procedure index-clear
+# Handler that clears the search entry fields.
 proc index-clear {} {
     global queryButtonsFind
 
@@ -2772,7 +3507,18 @@ proc index-clear {} {
         incr i
     }
 }
-    
+
+# Procedure index-query
+# The purpose of this function is to read the user's query and convert
+# it to the prefix query that IrTcl/YAZ uses to represent an RPN query.
+# Each entry in a search fields takes the form
+#    [relOp][?]term[?]
+#  Here, relOp is an optional relational operator and one of:
+#      >  < >= <=  <>
+#    which sets the Bib-1 relation to greater-than, less-than, etc.
+#  The ? (question-mark) is also optional. A (?) on left-side indicates
+#    left truncation; (?) on right-side indicates right-truncation; (?)
+#    on both sides indicates both-left-and-right truncation.
 proc index-query {} {
     global queryButtonsFind
     global queryInfoFind
@@ -2785,6 +3531,32 @@ proc index-query {} {
         if {$term != ""} {
             set attr [lrange [lindex $queryInfoFind [lindex $b 1]] 1 end]
 
+            set relation ""
+            set len [string length $term]
+            incr len -1
+
+            if {$len > 1} {
+                if {[string index $term 0] == ">"} {
+                    if {[string index $term 1] == "=" } {
+                        set term [string trim [string range $term 2 $len]]
+                        set relation 4
+                    } else {
+                        set term [string trim [string range $term 1 $len]]
+                        set relation 5
+                    }
+                } elseif {[string index $term 0] == "<"} {
+                    if {[string index $term 1] == "=" } {
+                        set term [string trim [string range $term 2 $len]]
+                        set relation 2
+                    } elseif {[string index $term 1] == ">"} {
+                        set term [string trim [string range $term 2 $len]]
+                        set relation 6
+                    } else {
+                        set term [string trim [string range $term 1 $len]]
+                        set relation 1
+                    }
+                }
+            } 
             set len [string length $term]
             incr len -1
             set left 0
@@ -2805,6 +3577,9 @@ proc index-query {} {
             } elseif {$left} {
                 set term "@attr 5=2 ${term}"
             }
+            if {$relation != ""} {
+                set term "@attr 2=${relation} ${term}"
+            }
             foreach a $attr {
                 set term "@attr $a ${term}"
             }
@@ -2820,6 +3595,12 @@ proc index-query {} {
     return $qs
 }
 
+# Procedure index-focus-in {w i}
+#  w    index frame
+#  i    index number
+# This procedure handles <FocusIn> events. A red border is drawed
+# around the active search entry field when tk3.6 is used (tk4.X
+# makes a black focus border itself).
 proc index-focus-in {w i} {
     global curIndexEntry
 
@@ -2829,6 +3610,14 @@ proc index-focus-in {w i} {
     set curIndexEntry $i
 }
 
+# Procedure index-lines {w readOp buttonInfo queryInfo handle}
+#  w          search fields entry frame
+#  realOp     if true, search-request bindings are bound to the entries.
+#  buttonInfo query type button information
+#  queryInfo  query type field information
+#  handle     handler called a when a 'listbutton' changes its value
+# Makes one or more search areas - with listbuttons on the left
+# and entries on the right. 
 proc index-lines {w realOp buttonInfo queryInfo handle} {
     set i 0
     foreach b $buttonInfo {
@@ -2887,6 +3676,12 @@ proc index-lines {w realOp buttonInfo queryInfo handle} {
     }
 }
 
+# Procedure search-fields {w buttondefs}
+#  w           search fields entry frame
+#  buttondefs  button definitions
+# Makes search entry fields and listbuttons. 
+# Note: This procedure is not used elsewhere. The index-lines
+#       procedure is used instead.
 proc search-fields {w buttondefs} {
     set i 0
     foreach buttondef $buttondefs {
@@ -2921,6 +3716,8 @@ proc search-fields {w buttondefs} {
     $w.0 configure -background red
 }
 
+# Init: The geometry information for the main window is set if 
+# saved in the windowGeometry - array.
 if {[info exists windowGeometry(.)]} {
     set g $windowGeometry(.)
     if {$g != ""} {
@@ -2928,8 +3725,10 @@ if {[info exists windowGeometry(.)]} {
     }
 }    
 
+# Init: Presentation formats are read.
 read-formats
 
+# Init: The main window is defined.
 frame .top  -border 1 -relief raised
 frame .lines  -border 1 -relief raised
 frame .mid  -border 1 -relief raised
@@ -2939,12 +3738,14 @@ pack .top .lines .mid -side top -fill x
 pack .data -side top -fill both -expand yes
 pack .bot -fill x
 
+# Init: Definition of File menu.
 menubutton .top.file -text "File" -menu .top.file.m
 menu .top.file.m
 .top.file.m add command -label "Save settings" -command {save-settings}
 .top.file.m add separator
 .top.file.m add command -label "Exit" -command {exit-action}
 
+# Init: Definition of Target menu.
 menubutton .top.target -text "Target" -menu .top.target.m
 menu .top.target.m
 .top.target.m add cascade -label "Connect" -menu .top.target.m.clist
@@ -2962,6 +3763,7 @@ menu .top.target.m.clist
 menu .top.target.m.slist
 cascade-target-list
 
+# Init: Definition of Service menu.
 menubutton .top.service -text "Service" -menu .top.service.m
 menu .top.service.m
 .top.service.m add command -label "Database" -command {database-select}
@@ -2981,13 +3783,17 @@ menu .top.rset.m
 .top.rset.m add command -label "Load" -command {load-set}
 .top.rset.m add separator
 
+# Init: Definition of the Options menu.
 menubutton .top.options -text "Options" -menu .top.options.m
 menu .top.options.m
 .top.options.m add cascade -label "Query" -menu .top.options.m.query
 .top.options.m add cascade -label "Format" -menu .top.options.m.formats
 .top.options.m add cascade -label "Wrap" -menu .top.options.m.wrap
 .top.options.m add cascade -label "Syntax" -menu .top.options.m.syntax
+.top.options.m add cascade -label "Elements" -menu .top.options.m.elements
+.top.options.m add radiobutton -label "Debug" -variable debugMode -value 1
 
+# Init: Definition of the Options|Query menu.
 menu .top.options.m.query
 .top.options.m.query add cascade -label "Select" \
         -menu .top.options.m.query.clist
@@ -3003,6 +3809,7 @@ menu .top.options.m.query.clist
 menu .top.options.m.query.dlist
 cascade-query-list
 
+# Init: Definition of the Options|Formats menu.
 menu .top.options.m.formats
 set i 0
 foreach f $displayFormats {
@@ -3011,6 +3818,7 @@ foreach f $displayFormats {
     incr i
 }
 
+# Init: Definition of the Options|Wrap menu.
 menu .top.options.m.wrap
 .top.options.m.wrap add radiobutton -label "Character" \
         -value char -variable textWrap -command {set-wrap char}
@@ -3019,6 +3827,7 @@ menu .top.options.m.wrap
 .top.options.m.wrap add radiobutton -label "None" \
         -value none -variable textWrap -command {set-wrap none}
 
+# Init: Definition of the Options|Syntax menu.
 menu .top.options.m.syntax
 .top.options.m.syntax add radiobutton -label "None" \
         -value None -variable recordSyntax
@@ -3044,6 +3853,16 @@ menu .top.options.m.syntax
 .top.options.m.syntax add radiobutton -label "GRS1" \
         -value GRS1 -variable recordSyntax
 
+# Init: Definition of the Options|Elements menu.
+menu .top.options.m.elements
+.top.options.m.elements add radiobutton -label "Unspecified" \
+        -value None -variable elementSetNames
+.top.options.m.elements add radiobutton -label "Full" \
+        -value F -variable elementSetNames
+.top.options.m.elements add radiobutton -label "Brief" \
+        -value B -variable elementSetNames
+
+# Init: Definition of Help menu.
 menubutton .top.help -text "Help" -menu .top.help.m
 menu .top.help.m
 
@@ -3051,23 +3870,26 @@ menu .top.help.m
         -command {tkerror "Help on help not available. Sorry"}
 .top.help.m add command -label "About" -command {about-origin}
 
+# Init: Pack menu bar items.
 pack .top.file .top.target .top.service .top.rset .top.options -side left
 pack .top.help -side right
 
+# Init: Define query area.
 index-lines .lines 1 $queryButtonsFind [lindex $queryInfo 0] activate-index
 
-button .mid.search -width 7 -text {Search} -command {search-request 0} \
+button .mid.search -text Search -command {search-request 0} \
         -state disabled
-button .mid.scan -width 7 -text {Scan} \
+button .mid.scan -text Scan \
         -command scan-request -state disabled 
-button .mid.present -width 7 -text {Present} -command [list present-more 10] \
+button .mid.present -text {Present} -command [list present-more 10] \
         -state disabled
 
-button .mid.clear -width 7 -text {Clear} -command index-clear
+button .mid.clear -text Clear -command index-clear
 pack .mid.search .mid.scan .mid.present .mid.clear -side left \
-        -fill y -padx 4 -pady 2
+        -fill y -pady 1
 
-text .data.record -height 2 -width 20 -wrap none \
+# Init: Define record area in main window.
+text .data.record -font fixed -height 2 -width 20 -wrap none -borderwidth 0 -relief flat \
         -yscrollcommand [list .data.scroll set] -wrap $textWrap
 scrollbar .data.scroll -command [list .data.record yview]
 if {[tk4]} {
@@ -3078,6 +3900,8 @@ pack .data.scroll -side right -fill y
 pack .data.record -expand yes -fill both
 initBindings
 
+# Init: Define standards tags. These are used in the display
+# format procedures.
 if {! $monoFlag} {
     .data.record tag configure marc-tag -foreground blue
     .data.record tag configure marc-id -foreground red
@@ -3086,11 +3910,26 @@ if {! $monoFlag} {
     .data.record tag configure marc-id -foreground black
 }
 .data.record tag configure marc-data -foreground black
-
-button .bot.logo  -bitmap @${libdir}/bitmaps/book1 -command cancel-operation
+.data.record tag configure marc-head \
+        -font -Adobe-Times-Bold-R-Normal-*-140-* \
+        -foreground brown -relief raised -borderwidth 1
+.data.record tag configure marc-small-head -foreground brown
+.data.record tag configure marc-pref \
+        -font -Adobe-Times-Medium-R-Normal-*-140-* \
+        -foreground blue
+.data.record tag configure marc-text \
+        -font -Adobe-Times-Medium-R-Normal-*-140-* \
+        -foreground black
+.data.record tag configure marc-it \
+        -font -Adobe-Times-Medium-I-Normal-*-140-* \
+        -foreground black
+
+# Init: Define logo.
+button .bot.logo -bitmap @${libdir}/bitmaps/book1 -command cancel-operation
 if {[tk4]} {
     .bot.logo configure -takefocus 0
 }
+# Init: Define status information fields at the bottom.
 frame .bot.a
 pack .bot.a -side left -fill x
 pack .bot.logo -side right -padx 2 -pady 2 -ipadx 1
@@ -3108,7 +3947,25 @@ pack .bot.a.target -side top -anchor nw -padx 2 -pady 2
 pack .bot.a.status .bot.a.set .bot.a.message \
         -side left -padx 2 -pady 2 -ipadx 1 -ipady 1
 
-ir z39
-#z39 logLevel all
+# Init: Determine if the IrTcl extension is already there. If
+#  not, then dynamically load the IrTcl extension.
+if {[catch {ir z39}]} {
+    set e [info sharedlibextension]
+    puts -nonewline "Loading irtcl$e ..."
+    load irtcl$e irtcl
+    ir z39
+    puts "ok"
+}
+
+# Init: Uncomment this line if you wan't to enable logging.
+z39 logLevel all {} irtcl.log
+
+# Init: If hostid is a valid target, a new connection will be established
+# immediately.
+if {$hostid != "Default"} {
+    catch {open-target $hostid $hostbase}
+}
+
+# Init: Enable the logo.
 show-logo 1