Press F1 (Help screen) before typing those in (so you won't hit an already defined key). Then press ESC or enter to retrun to game.

Codes for ALL of the Patches:
ineedabiggun = Super Chain Gun powerup
holokurtisfun = Dummy powerup
nastyshotthanks = Homing sniper grenade
tornadoaway = Twister powerup
iliketolob - Mortar powerup
kill - suicide!
486ok = Allow 486 machines to run