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  Name:     fkey() - get string assigned to a function key
  Usage:    <string> = fkey(<num>)
  Params:   integer <num> - the function key number you want to
            to check

  Returns:  a string equal to the text assigned to the defined
            function key, or null ("") if key not defined.

 ---------------------------------- Example ---------------------------------

                 set FUNCTION 10 to "This is FUNCTION 10"
                 ? fkey(10)
                 * prints "This is FUNCTION 10"