Can someone please tell me if there is a way to take a screen capture of a commercial DVD movie playing on my Mac's DVD player? I can use either my G3 or G4 iMacs for this. Both are on Jaguar. I already tried the usual combinations of shift+apple+3 and shift+apple+4, but neither of those work while the DVD player is on. How do people get all of those screen captures from movies? Thank you.