Tcl Programming
Tcl 
is a scripting language created by John Ousterhout. It can be used 
interactively, or by running scripts (programs) which can use a package system 
for structuring, hence allowing to do much with little code. This book discusses 
the GUI toolkit Tk in considerable extent, even though it's not in the title. 
For most users, Tcl/Tk form a single conceptual entity.
Author(s): wikibooks.org
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