[Daniel_LaFleur], I think you’re thinking of netcams, i.e. cameras attached to a network. Webcams usually refer to cameras generally purposed for communication over a network, but generally connect through USB or IEEE-1394 (Firewire). Yes, the drivers control the webcams, but most of the drivers are set up to interface with Window’s multimedia driver subsystem, which generally gives exclusive control of a device to one program at a time.
[RebeccaMarils], let me also welcome you to the Chief Delphi forums. After seconding [rtfgnow]'s suggestion, here’s a couple of possible answers to your question. There are several commercial software packages out there that do what you describe. Assuming you’re using Windows, a quick Google search yields WebCamSplitter and CamSplitter. A little more digging yielded a free download called ManyCam that seems to do what you want. I haven’t tried it myself, but it apparently got 5 stars from the C|Net Download editors.
Good luck,
–Ryan