One way to do it is to render to a buffer slightly smaller than your viewport, then copy that image to the screen, scaling it up slightly as you go. That works OK, but tends to blur things.
Teamonkey that's the exact opposite of how FSAA works.
FSAA works by rendering a buffer bigger than the screen 2x at least but it can be more. The resulting image is then blended down to screen size. It's a hardware function on most cards. Unfortunately it seems hard to reliable switch on and off in B3D. Not sure about Max.