INTRUDER -- Video game for MS-DOS-compatible computers
        Summary of keyboard commands


        Active keys during attract mode: 
            ESCAPE - exit from current screen and display next screen
             SPACE - pause current screen
             ENTER - start game
                F1 - quit game

        Active keys during game play:
            ESCAPE - request pause
                 R - reset/restart game
                F1 - quit game
                 M - mute (turn off) sound
             SPACE - launch missle (if keyboard selected)
             ENTER - launch missle (if keyboard selected)
             SHIFT - move ship left (if keyboard selected)
                 Z - move ship right (if keyboard selected)
                 1 - set ship speed = slow
                 2 - set ship speed = intermediate
                 3 - set ship speed = fast
                 4 - set ship speed = faster

        Active keys during name-entry:
            ESCAPE - cancel name-entry
            ARROWS - move cursor
            INSERT - insert highlighted letter