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put_parm (num, value)

     Usage: Sets the value of a parameter passed into a function.  This
            allows values (strings or integers) to be returned to a
            function via the arguments, like Pascal VAR parameters.

Parameters: Num .int. is the parameter number to update, starting at 0.
            Value .int or string. is the new value to assign.

   Returns: Greater than 0 for success, 0 for failure.