i have a NVIDIA Geforce4 ti4200 on my pc and i might get a voodoo 3 2000 pci card (to play glide games) and i want to obviously plug my monitor into the geforce 4. the prob is will i have to plug the monitor into the voodoo if i want to use it fo glide games or so? ???

I can't speak for a Voodoo³ but at least on Voodoo² i remember there were Glide-Only drivers (i have one on an old game CD).

...looking on Falconfly's great site...

There is one Voddoo³ driver with only Glide and D3D functionality. Maybe there is an option to disable D3D (Voodoo²'s have this option) and voila, you have a Glide-Only Driver. But the driver is very old so i think you schould update glide2x glide3x and corresponding dll's with one's from a newer 3Dfx Voodoo³ driver or update to one of those third party Glide drivers (or do they run alone???). And don't forget to set the BIOS option to choose wich is your primary card (in your case the nvidia). As far as i know you can only choose between AGP and PCI and so you have to set it to AGP.

Regards,
Andreas

P.S.
Don't forget, this is only theory.