How to make one window for dual displays?

Here is my current setup in which I need to work somehow. I have a linux box with an nVidia Quadro4 NVS 400 card that supports up to four monitors. I can create two sets of stretched desktop displays so that I have basically two displays that are 2560x1024(stretched across two monitors) each. I can’t find a way to merge those two sets together and still keep the OpenGL acceleration. But, I can keep them seperate and they stay accelerated.

How do I setup a program so that it can drive the graphics on displays :0 and :1? It is all full screen.