The Tcl Tutor [http://www.msen.com/~clif/TclTutor.html] is a free, downloadable, multi-platform tutorial for Tcl. There are over 40 lessons, and each one shows sample code. What makes it even more useful is that the tutorial window has three panes. The first pane shows a lesson, the second shows editable sample code, the third will let you run the sample code in a completely self-contained manner so you can change parts of the code, run the example, and see how your changes affected the output. Seems like this would be a great platform on which to build additional lessons (see [Tk demo framework] for initial discussion). However, I don't know whether the author, [Clif Flynt], has an interest in collaborating. ---- [Category Application], [Category Tutorial]