Press the [Left Ctrl] [Alt] during game play to display the console window.
Whilst in game press the  key to bring down the ingame console. You can edit this key by going to x:Program Filesid SoftwareQuake 4q4base and opening the file 'Quake4Config'. Look for line bind "" "toggleconsole" and change "" to the desired key i.e. bind "" "toggleconsole".
Now enter the following cheats to activate the corresponding cheat function:
god - God mode
Air Defense Base: airdefense1
Weapon mod names
October 23, 2005 - 5:31am