If you pause the game and you should find that you are able to move
 your gun target around.
 
 For infinite lives in this game, use the DOS utility DEBUG. First
 backup your game to be edited, then type the following from the DOS
 prompt: 
 
 ren gitum.frm cheater.cht
 debug cheater.cht
 e 3a6 c6 6 c0 85 c3 ff 2e 1f 0
 Then type:
 w
 q
 
 Then rename CHEATER.CHT back to its previous name.