Everything starts with [P] [Bbackspace]

arjan - HAHAHA displayed on screen
gunhed - gives you all weapons
tim - displayes AWESOME on screen
check - displays some numbers on the screen
greetz - opens an "Arjan Greetz" window
doom - flashes the screen red (ar-ar!)
        plus there's another little thing I won't tell you about...
lamer - jump to next level
mark - will lose a life and start over
apogee - toggles between 16-color EGA and normal
bouf - temporary invincibility
sable - super sonic speed
cstrike - gives you the air-board
hooker - takes you to bonus level when current stage is done
bad - gives you the bird *yuk-yuk*
ken - don't know what it does
hocus - teleports, provided you have an enemy above or below you