Introduction to TCL/TK
TCL is the abbreviation for ToolCommandLanguage.
---> An excellent intro on the TCL/TK language can be found at: http://en.wikipedia.org/wiki/Tcl
--> See TclTk
The WikiT site is really the official TCL/TK site. It has all the references you need, all the help, a private chat etc. http://wiki.tcl.tk/
Printed Books
Downloadable courses
Online courses
Internet TCL/TK help groups
For other programming languages in the same series, see: IwannaLearn