qbasic.hlp (Topic list)
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ON Keyword
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Performs different actions as part of several statements:
 
    ■ Enables error trapping when used with the ON ERROR statement.
    ■ Enables event trapping when used with the event ON statements
      (COM ON, KEY ON, PEN ON, PLAY ON, STRIG ON, and TIMER ON).
    ■ Specifies an event to trap when used with the ON event statements
      (ON COM, ON KEY, ON PEN, ON PLAY, ON STRING, and ON TIMER).
    ■ Specifies an expression to evaluate when used with the ON...GOSUB
      and ON...GOTO statements.
 
See Also    ◄COM, ON COM►      ◄KEY, ON KEY►        ◄ON ERROR►
            ◄ON...GOSUB, ON...GOTO►                 ◄PEN, ON PEN►
            ◄PLAY, ON PLAY►    ◄STRIG, ON STRIG►    ◄TIMER, ON TIMER►