[This page is a place holder for Cameron and others to write about the topic of using Tk to create intelligent interfaces - the creation of interfaces that anticipate the needs of the user and then customizing the interface so that only the right things can be done at any point...]
RS hopes the stupid chevrons (that hide parts of menus, only to make you curious) as seen on recent Windowses are not counted as "intelligent"... though they adapt - if you selected "Paint" from a chevroned menu, next time it'll be out in the open...
[Kernighan; context-sensitivity; Tk "gray-out" idioms; ...]