Various Cheats
Place the following line as the last line in the "hardline.cfg" file. Type it exactly as shown or it won't work (note case sensitivity and spaces):

CHEATING IS SOMETIMES USEFUL BUT FOR HOW LONG ???

Now you may enter any of the following "Codes":
X = Invincible
Backspace = Kill All Enemies on Screen
Insert = Full Health
Page-Up = Adds Accessory Weapon Ammo
Home = Adds Main Weapon Ammo