[Tcl] is a scripting language and stands for "Tool Command Language".
[Tk] is a [GUI] built on top of Tcl and is an abbreviation for "Toolkit".

For a quickstart introduction in scripting, see [Cameron Laird]'s column in SunWorld, 
called "Regular Expressions", which kicked off with this article:
   * http://www.sunworld.com/sunworldonline/swol-08-1998/swol-08-regex.html

Look for more info about Tcl/Tk at:
   * http://www.tcl.tk/
   * http://www.purl.org/net/tcl-faq/

[WiKit] is written in Tcl/Tk.
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[Category Language]