Camera Trigger help

I dont know if this has been posted somewhere or not, but I need to know how to make the camera follow the unit (behind it). Does any one know?

I've had some attempts, but they have all failed. =(

I beleive there is a comand that sets the camera on the unit. It must be under the camera section.

u should make a camera that has the angles u want, then make a trigger camera lock camera <follow> to <unit u want to have the camera attached to> i added u to my msn list to talk to u better

What I mean is I want the camera to follow the unit, so I see what it sees, kinda like a fps, except you can still see the character on your screen, just the back of it at all times.