Start the game normally. When in the game window type: arno
No confirmation will appear.
Confirmations will appear on these:
Code Effect
Ctrl + F3 Freeze all on/off
Ctrl + F4 God Mode on/off
Shift + F4 Invisibility
Ctrl + F4 More ammo (retype for even more)
Ctrl + F12 Win current mission
Shift + F10 X / Y position of the pointer