How do you check for frames per second in a game?

[Zero In]

LIke for instance Half-Life and Unreal, How do you check for frames per second? Is there a command to be entered in the console, or is there a third-party program to be used?

 

[BFG10K]

Quake 3

~
timedemo 1
demo demo00x (where x = 1 or 2)
~

Unreal
~
timedemo 1
~

You should do a search because this topic has been covered a lot of times before.

 

[AdamK47]

You try typing FPS over and over again in Diablo II. LOL
I had a guy do that to me while I was on Battle.net. It was getting very annoying.