Modes of User Interaction

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

               Keyboard
Space Bar - fire missle
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
Right Arrow - increase speed of moving target
Left Arrow  - decrease speed of moving target