There are different ways to get multimonitors.
1. Use a video card that has more than one VGA-video output.
2. Get one or more card that uses different slot, one is agp and the others are pci.
3. Use a video card that has output to TV and VGA-video, but I never tested the output to TV. The TV will be the second monitor.
The program currently support only clone mode and not span mode unless the video card is able to fool the program that both monitors are used by one card. Future render engine will support span mode and the UI will be a mess.
There is a trick that I mentioned above running the screensaver manually in window mode and stretching the window to cover the other monitors.
If I forget other configurations, feel free to correct me or add to what I listed here.