ON STRIG(n) - Event trapping statement that specifies a subroutine to
              branch to when joystick trigger n is pressed
Syntax
  ON STRIG(n) GOSUB {linelabel | linenumber}
    - n, an integer expression, is the trigger number:
      0 = lower button, first joystick    2 = lower button, second joystick
      4 = upper button, first joystick    6 = upper button, second joystick
    - linelabel or linenumber is the first line of the event-handling
      subroutine to branch to when the trigger is pressed
 
See Also  <STRIG ON>