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Grabbing rectangle of pixels from PICT in window, using mouse

Hello MCL interface experts;

  I'm looking for a routine which will grab a chunk of pixels from a window
in MCL, using a rubberband-style rectangle controlled from the mouse: any pointers to the appropriate traps to use for the rubberband box, or to code, is
appreciated. Thanks, kerry (kerry@crl.com)

P.S. I didnt spot anything about this class of problem in the MCL FAQ. Did I
just overlook it, or is there a separate MCL graphics FAQ?