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ON event - Event trapping statements that indicate the first line
           of an event-trapping subroutine
Syntax
  ON event GOSUB {linenumber | linelabel}
    ■ event is a keyword that identifies the event to trap
    ■ linelabel or linenumber is the first line of an event-handling
      subroutine
  ON event Statement           Type of Event Trapped
  ◄ON COM(n)►                  Characters received at communications port n
  ◄ON KEY(n)►                  Keystroke on key n
  ◄ON PEN►                     Lightpen activity
  ◄ON PLAY(n)►                 Less than n notes in background music buffer
  ◄ON STRIG(n)►                Activity on joystick trigger n
  ◄ON TIMER(n)►                Elapsed time event
 
See Also  ◄COM(n) ON►  ◄KEY(n) ON►  ◄PEN ON►  ◄PLAY ON►
          ◄STRIG ON►  ◄TIMER ON►