WIMP stands for:

 W: Windows
 I: Icons
 M: Menus
 P: Pointing device

This is a term oftimes used to refer to the Graphical User Interface GUI interfaces commonly found on contemporary [desktop] systems.

If you're going to get into doing this sort of thing with Tcl, use Tk (or [fltk], or ...) see Playing WIMP for a toy icon system.

See also: [1] for "weakly interacting massive particles".

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