DNKROZ or DNCORNHOLIO (god mode)

DNSTUFF (full ammo, weapons, inventory and all keys)

DNITEMS (full inventory and all keys)

DNINVENTORY (full inventory)

DNCASHMEN (Duke throws cash when you hit spacebar)

DNCLIP (walk through walls)

DNUNLOCK (toggles all locks so you don't need the access cards)

DNSHOWMAP (shows the map of the level)

DNCOORDS (shows coordinates)

DNDEBUG (diplays debug information)

DNMONSTERS (toggles monsters on/off)

DNHYPER (steroids effect)

DNMAJOR (unlimited jetpack juice)

DNSCOTTY[episode][level] (warps you to desired level)

DNRATE (shows frame rate)

SKILL[skill number] (changes difficulty level)

DNVIEW (changes to chose view:not totally useless,but F7 does the same thing)

DNCOSMO (tells you to buy Apogee's Cosmo game)

DNALLEN (tells you to buy Apogee's Major Stryker game)

DNBETA (says "Pirate suck")