The demo is sort of a game. You can shoot, get shot, kill and die. A player must get shot couple of times to. The best setup is to have a dedicated server. A fast 486 will do just fine.
Windowed mode is specified with -win xxx yyy.
By default Poly will use the GL system installed on your computer. If you have Voodoo1 card you can use Mesa .dll's provided in 3DFX directory. Just copy the .dll files into the demo directory. The demo uses QSound 3D sound library provided to me by Warthog. This version supports IPX and up to 4 com ports.