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ON KEY(n) - Event trapping statement that specifies a subroutine to
            branch to when key n is pressed
Syntax
  ON KEY(n) GOSUB {linelabel | linenumber}
    ■ n, an integer expression, is the number of a function key, direction
      key, or user-defined key
    ■ linelabel or linenumber is the first line of the event-handling
      subroutine
 
See Also  ◄KEY(n) ON►  ◄KEY(n)►