hi Paul,

 PR>         I'm porting a tui to the os/2 platform, and figgured while
 PR> doing so, I'd make some improvements... Here is what I would like to
 PR> add. I would like to add support for writting to a window that is
 PR> overlaped by another window (background window)... So far the only
 PR> way I can think of doing that is to have a chunk of memory the size
 PR> of the window, update it all at every window write request, and then
 PR> when writting to the actual screen I'll have to check every other
 PR> window shown to see if it overlaps it...

If you follow the order of the windows, starting with the screen background
and ending with the window which has the context, you don't have to
recalculate each windows visibilty.  Use a buffer for the entire screen and
show the end result when you're done moving the windows into it: what
should be invisible, will've been overwritten.

regards,
         hugo