How to choose which Display Adaper is used for Direct3D...?

[Superwormy]

I have a Matrox G400 Dual-Head AGP and two Diamond Monster 3D II Voodoo2s in SLI mode.

Right now, Half-Life Counterstrike defaults to Direct3D on the Matrox card. How do I get it to use teh Voodoo2s for Direct3D instead?

Thanx.