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 multi-platform and has very wide support. It can be downloaded on the NET, and it runs TCL scripts for back-end 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.