With these, 3dfx Interactive has introduced some ability to tweak the alpha-blending rendering qualities of the drivers and games that support such a rendering feature. Alpha-blending is a feature that enables pixels to "look" solid, transparent (or partially so) or even invisible. An example would be explosions and its resultant smoke (if the game implements smoke). Map alpha-blending to polys and you'll get other effects such as see-through glass and water.
This document, albeit just a short one, was created just after installing these new drivers. I was eager to test it out in just one instance or game - Q3TEST (which, really, don't qualify as a "game" since it's just a test release). Much of the complaint from Voodoo3-users have been the awful screen-door effect look of the smoke of explosions (esp the Rocket Launcher's). I've seen it myself and as a user, couldn't wait to see what this driver set improves upon. So, I fired up Q3TESTv1.07. I'd taken some screenshots based on the previous drivers set to compare with these new drivers.