Thanks for the tip. Reading a little about multi mon in X it sounds like there are few possibilities that might work. Hopfully I can do other some things in X that I am able to do in Windows with DX9 such as create perfectly VBI frame synchonized image frames which update at the projector refresh rate... I imagine this is possible at some level since MythTV must be able to do this, although it might all be timed in the video card hardware.