You don't need three windows to have three cams in GEM. SIze the one window 3X by Y and tile the images across. Do you even need to see the video onscreen beyond testing?
Thanks Derek .. I was using GEM already and that was my original problem, because I wanted to have multiple GEM windows open to show all 3 Cam's at once in one instance of PD ..
I'm using the webcams to detect motion and supply XYZ coordinates to a scanned synthesis patch ... I've attached a shot of the motion detection patch to make things clearer ..
Dave