Modes of User Interaction

           Common Popup Menu
with the standard items 
      show discussion 
      close discussion
      close program

               Keyboard
Space Bar - fire projectile
f, F      - set display to full screen
w, W      - set display to window
r, R      - reset targets
e, E      - exit program

	       Special Keys
Up Arrow   - increase rotation rate of weapon
Down Arrow - decrease rotation rate of weapon