By 
Press the Talk button (T) and use any of the cheats below:
/i win -Win current mission
/big ass -exits game
/ouch -take damage
/goodies -Maximum weapon upgrades
/weezie -Toggle enemy AI on/off
/3prong -Toggle world shadows
/wilcox -Makes you and enemies shake
/onass -Knocks you over
Ctrl + Alt + 6 All weapons
Ctrl + Alt + 5 Extra ammunition
Ctrl + Alt + 3 Ignored by enemies
