Cheats

Shift-c	Toggle availability of countermeasures for all ships.
k	Kill targeted ship.
Alt-Shift-k	Do 10% damage to target.
Shift-k	Destroy targeted subsystem on target. Note: This does not appear to work.
Alt-k	Do 10% damage to yourself.
i	Toggle self-invincibility.
o	Toggle Descent-style physics. This means that you have no inertia or momentum, your afterburners do nothing but jerk you to a halt instantly, and you can slide with the keypad +, -, 1 and 3 keys.
w	The player has infinite weapon energy and missile ammunition.
Shift-w	All ships have infinite weapon energy and missile ammunition.
c	Message enemies. Note: This does not appear to work.
g	Mark all primary goals complete. Note: This is largely useless, as once cheats are enabled, progress in a campaign is unallowed.
shift-g	Mark all secondary goals complete. Note: This is largely useless, as once cheats are enabled, progress in a campaign is unallowed.
alt-g	Mark all bonus goals complete. Note: This is largely useless, as once cheats are enabled, progress in a campaign is unallowed.
9	Cycle forward through ALL secondary weapons, including the Shivan and Vasudan ones and cruiser/destroyer only ones. This includes the Unknown Bombs, which are Tsunami/Harbinger sized, but do not require a lock to be fired.
shift-9	Cycle backwards through ALL secondary weapons
0	Cycle forward through ALL primary weapons, including the Shivan and Vasudan ones and cruiser/destroyer only ones. This includes the Shivan Super Laser, AKA the Lucifer Weapon. This can kill a Demon at 6 kilometers in only a couple of shots, but is not as useful in a dogfight because of its slow flight time through the air.
shift-0	Cycle backwards through ALL primary weapons.
r	Issue Rearm order for current target, or player if there is no target.