TCL/TKs (Tool Command Language/Tool Kit) strength is that it is a small, interpreted, language that can be embedded, access graphics and system features, and is extensible. It also is multiplatform and has very wide support.  It can be downloaded on the NET, and it runs TCL scripts for backend processing. TCL is a language, called the Tool Command Language.  TK is a set of extensions or "widgets"(the actual official designation) that happened to be written by TCL’s author to add graphic capability to his TCL interpreter they include things like list boxes, entry boxes, radio buttons, check boxes, etc.... In fact, prior to TCL/TK 8.0, TCL was at version 7.3, and TK was at version 4, as I recall. In a way, TCL’s relationship to TK is kind of like VBs relationship to activex(which ALSO has controls as mentioned above, and are sold as one package). In fact, a VB user can program for a long time without realizing that he or she is using activex components all over the place.  

Tcl was originally intended to be a reusable command language. Its developers had been creating a number of interactive tools, each requiring its own command language. Since they were more interested in the tools themselves than the command languages they would employ, these command languages were constructed quickly, without regard to proper design.

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