Is there any way for FVWM to highlight user-chosen areas of application windows independently from the application? I'm thinking of an effect similar to what one can achieve by drawing on the CRT with a whiteboard marker :) except that ideally the highlights would be associated with the window (thus going away when the window is iconified, or covered by another, or when viewing a different page or desktop). I can get a very limited version of this by selecting text in an xterm, but can have only one such area marked at a time -- the first goes away as soon as I select something else, whether in the same xterm or another.
The implementation approach which comes to mind would involve FVWM reserving one bitplane -- half of the colormap -- so as to create an alternative set of colors, but I wouldn't be all that surprised if those with more knowledge of X-windows thought of other methods that might be less resource-intensive or usable on displays that don't have colormaps.
