Type "www.volition-inc.com" and hold ~. Then type one of the following codes:
Send message to enemies: C
Toggle countermeasure availability for all ships: Shift + C
Kill selected target: K
Destroy targeted subsystem: Shift + K
10% damage to ship: Alt + K
10% damage to target: Alt + Shift + K
Invincibility: I
Toggle invincibility for target: Shift + I
Toggle Descent-style physics: O
Infinite weapons for all ships: Shift + W
Infinite weapons for only your ship: W
All primary goals complete: G
All secondary goals complete: Shift + G
All bonus goals complete: Alt + G
Scroll forward through secondary weapons: 9
Scroll backward through secondary weapons: Shift + 9
Scroll forward through primary weapons: 0
Scroll backward through secondary weapons: Shift + 0
Rearm request for target: R