''based on Tcl/Tk 8.4b1''

'''New packages'''
   * dde 1.2
   * http 2.4.2
   * msgcat 1.3
   * tcltest 2.1
'''New Tcl commands'''
   * lset
'''New Tk commands'''
   * [spinbox]
   * [panedwindow]
   * [labelframe]
'''Removed Tk commands'''
   * All private commands matching ''tk[[A-Z]]*''
'''New Tcl subcommands'''
   * array statistics
   * file link
   * file normalize
   * file separator
   * file system
   * info functions
   * interp recursionlimit
   * ''interp'' recursionlimit
   * memory active (''TCL_MEM_DEBUG'')
   * memory init (''TCL_MEM_DEBUG'')
   * memory onexit (''TCL_MEM_DEBUG'')
   * memory tag (''TCL_MEM_DEBUG'')
   * namespace exists
   * trace add variable|command|execution
   * trace remove variable|command|execution
   * trace info variable|command|execution
'''Removed Tcl subcommands'''
   * memory display (''TCL_MEM_DEBUG'')
'''New Tk subcommands'''
   * clipboard get
   * image inuse
   * ''photo'' transparency
   * ''text'' edit
   * wm attributes
   * wm stackorder
'''Expanded syntax/new options'''

array names ''arrayName''
?''mode''?
?''pattern''?

bell ?-nice?

binary format wW ...

binary scan ''string'' wW ...

button ''pathName'' ?... -disabledbackground ... -disabledforeground ... -readonlybackground ...?

checkbutton ''pathName'' ?... -overrelief ...?

entry ''pathName'' ?... -compound ... -overrelief ...?

expr ... ne ... eq ... wide(...)

fconfigure ''serial''
-mode ''baud,parity,data,stop''
-handshake ''type''
-queue -timeout ''msec''
-ttycontrol ''signalMap''
-ttystatus -xchar ''charPair''
-pollinterval ''msec''
-sysbuffer ''sizeList''
-lasterror

frame ''pathName'' ?... -padx ... -pady ...?

glob -tails ''pattern'' ...

grid columnconfigure ''master index'' ?... -uniform ...?

grid configure ''slave'' ?''slave'' ...? ?... -padx {left right} ... -pady {top bottom} ...?

grid rowconfigure ''master index'' ?... -uniform ...?

info script ?''filename''?

lindex ''list''
?''index'' ...?

listbox ''pathName'' ?... -disabledforeground ... -state ...?

lsearch -all -ascii -decreasing -dictionary -increasing -inline -integer -not -real -sorted -start

''menu'' add ''type'' ?... -compound ...?

menubutton ''pathName'' ?... -compound ...?

pack configure ''slave'' ?''slave'' ...? ?... -padx {left right} ... -pady {top bottom} ...?

radiobutton ''pathName'' ?... -overrelief ...?

regsub ?''switches''?
''exp string subSpec''
?''varName''?

text ''pathName'' ?... -autoseparators ... -undo ...?

''text'' delete ''index1 index2 index3 ...''

''text'' get ''index1 index2 index3 ...''

tk_getOpenFile ?... -multiple ... -message ...?

tk_getSaveFile ?... -multiple ... -message ...?

toplevel ''pathName'' ?... -padx ... -pady ...?

unset ?-nocomplain? ?--? ?''name'' ...?

'''New Tcl global variables'''
   * tcl_platform(wordSize)
'''Removed Tk global variables'''
   * tkPriv
'''New Tk [virtual event]s'''
   * <<Selection>>
   * <<Modified>>
'''Changed behavior'''

''fcopy'' now respects encodings of its channels.

''format %ld'' and likewise treat argument as wide integer

''scan %ld'' and likewise no longer ignore the field width specifier

''source'' treats the byte 0x1a as an end-of-file character on all platforms.

''subst'' treats ''break'' and ''continue'' during command substitution differently

Global variables ''tcl_traceExec'' and ''tcl_traceCompile'' only have their tracing function in the TCL_COMPILE_DEBUG variant of Tcl.

''tk_getOpenFile'' and ''tk_getSaveFile'' are different in whether the returned file name includes the extension.