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     The _wrapon function controls whether text output with the
     _outtext function wraps to a new line or is simply clipped when
     the text output reaches the edge of the defined text window. The
     <option> argument can be one of the following manifest constants:
 
     Constant      Meaning
 
     _GWRAPOFF     Truncates lines at window border
     _GWRAPON      Wraps lines at window border
 
     Note that this function does not affect the output of
     presentation-graphic routines or font routines.
 
     Return Value
 
     The function returns the previous value of <option>. There is no
     error return.
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