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  wclrfield                                                             WNDWC
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  Function       Clears a field.
  Syntax         void wclrfield( unsigned char row, unsigned char col,
                                 unsigned char cols, int attr );
  Remarks        The field is cleared starting at (row,col) using the
                 attribute attr (SAMEATTR is permitted).  To clear using the
                 window attribute, pass attr as tws.wndwattr.
  Return value   None.
  Screens        All video pages and virtual screens.
  EOS            Set to (row,col).
  Restrictions   Stay within window limits.