Most everyone says that the best starting point for learning tcl is john
ousterhout's "tcl and the tk toolkit".

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The two programs in this directory show how tcl/tk can be interfaced
with C.  The basic program is very simple and explains how to make and
display a simple control panel.  The complex program displays multiple
control panels, links variables, and uses callbacks (c func which defines
a new tcl proc).

Most of this functionality is wrapped up in the widget library I have
implemented in ~/Src/Lib/Widget -- but this is a good reference.

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I downloaded tcl/tk 8.0 from http://sunscript.sun.com/ -- there are
lots of docs there on the packages.

I also installed SpecTcl v1.1 in /usr/local/contrib/mod/common/src/specTcl1.1
and provided soft links to specTcl and specJava in common/bin.

SpecTcl is a gui designer for Tcl/tk.

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To compile the .tcl files into your C program, just put them in a string
and call eval on the string (include them as .h files).

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For tcl/tk examples, the best thing is the "tk widget tour" on the pc.

it has widgets plus code snippets.

on a pc, check in the start menu under tcl, or open up 

C:\Programs\TCL\lib\tk8.0\demos\widget.tcl

Or in unix-land, check /usr/local/contrib/mod/common/lib/tk8.0/demos/widget

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when linking, remember to include -ltk before -ltcl (tk uses tcl calls)

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weberh 2/4/98