I have a google about this there.
I will shortly be replacing my "mirror-door" dual-boot G4 with a new 27-inch iMac. I've always used the G4 with the Apple 20-inch cinema display (it works perfectly well with both OS9 and OS X despite anything you've read to the contrary). I have a couple of programs which will only run in OS9 (must be native, not Classic) so I will keep the G4 for this purpose, but I don't have room for two displays. OK, here's the question - is there any way that the new 27-inch iMac can act as a monitor for the G4 running OS9 for the few occasions I will still need OS9? I know it can be used as a remote monitor for OS X using special adaptor cables...but OS9? Any information appreciated. Thanks