There are a lot of articles in Category GUI
This page aims to be a "newbie-friendly"-pointer to the most essential topics.Tcl
- the "tool-command-language". All the elements for programming (but console-only).Tk
- the "toolkit", an extension to tcl, for graphics, GUI, etc.
- 7GUIs - a sequence of mini-applications, each highlighting a useful GUI pattern in a short implementation
See also edit
- Tk-Demos - forms.tcl : Simple entry-form for name, address, phone etc.
But it is hard to see "the useful code", with all the surrounding demo-code.