[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...
schlenk likes the chevrons actually (after getting used to them). But actually they cure symptoms (to large menus) instead of curing the problem (overloaded interfaces).
[Kernighan; context-sensitivity; Tk "gray-out" idioms; ...]
See also BOOK About Face.