There is a two step procedure to active the cheat mode. (This cheat mode only works in the registered version. It does nothing in the shareware version.)

Type CHEAT at the Main Title Screen. All keys need to be pressed one at a time. When you get it, you'll see the message that says "Cheat Active" (it really isn't yet).

During the game, hold down the Backspace key, and then press the H & S keys at the same time. When you are successful, you'llsee a message that says "Cheat Mode On" (it is now). You can hit these three keys again to turn the cheat mode off.

Once activated, you can press these keys to activate various options. Please note that you must hold down the TAB key first before pressing the others, or it won't work.
TAB O = Fire Options
TAB R = Rapid Fire
TAB S = Shield Options

https://www.youtube.com/watch?feature=player_embedded&v=Ug_-N9N7h2c
Released: 1993 Apogee Software
Genre: 1-Player 2D Shooter

Major Stryker was made Freeware in March 2006 & can be downloaded from the Apogee Software HP.