While playing a game, press ~ and enter one of the following codes at the console window to activate the corresponding cheat function:

Granted Wish - Cheat Code

Set jump height; 500 is default - setjumpz [number]
Kill all enemies - killpawns
Fly mode - xfly
God mode - xgod
Full ammunition - allammo
No clipping mode - xghost
Set speed; 2 is default - setspeed [number]