I was wanting to make a 3d chat room. Where people can choose a model to represent themselves and move in a 3d enviroment, but be able to chat reliably. So what protocol would be good for this? Does a fps type game use the same protocol as a chat server? And if not, do I need to use two protocols at once? Is this even an option? Would the way fps type games (half-life, quake, doom) let players talk to one another with a little chat input, work for what im wanting to do? Any advice would be greatly appreciated.

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So what protocol would be good for this?

well i would think they would use tcp for chat cause if u us UDP u could lose some text typed in by other clients.

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And if not, do I need to use two protocols at once? Is this even an option?

as for that, i have no idea. try looking up on google how the pros do it, or here at gamedev.

hope that helps
Jake

Protocols currently in use for these kinds of applications, that I know about:

There View Protocol: There.
Streaming 3D: Second Life.
AIM/Yahoo Text: IMVU.