I should have you shot just for thinking of using one of these codes, Duke would not approve......
kroz,dncornholio = God mode
dnstuff = Gives you everything (Access cards, Weapons, etc.)
dnweapons = Gives all the weapons
dnitems = Gives all the items
dninventory = Gives you full inventory
dnscotty### = Level warp (eg. dnscotty205 would take you to E2L5)
dnhyper = Steroids all the time!
dnclip = The ability to walk through walls!
dnmonsters = Toggles the presence of monsters.
dnkeys = Gives you all the keys
dnshowmap = Shows you the whole map when you hit tab!
dnrate = Displays your frame rate
The following file is a text version of the Duke Secrets.