For the demo
            During the game
            NUM LOCK = Invulnerability

            Command line parameters for TEKD1.EXE
            (ie TEKD1 NOENEMIES to start the game)
            NOENEMIES = Removes everyone but you
            NOGUARD = Removes the guards from the game.
            NOCHASE = Removes the shooting enemies from the game.
            NOSTROLL = Removes the innocent bystanders from the game.

            For the full game
            ALT+SHIFT+G = Invulnerability
            ALT+SHIFT+W = All weapons, lots of ammo, and all keycards.
            ALT+SHIFT+J = All matrix symbols that you would normally collect by
            killing the bosses.