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  wlinepart                                                             WNDWC
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  Function       Places a single line part of the same type as the window
                 line set at a window-relative location.
  Syntax         void wlinepart( unsigned char row, unsigned char col,
                                 int part );
  Remarks        This routine places the part using wsline and wndwattr from
                 the top window record.  It is usually used for crosses or
                 tees, but there are 15 different parts that can be used.  If
                 SAMEATTR is used for wndwattr, then the attributes will
                 remain the same on the screen.  If wsline=NO_BORDER, the
                 function is ignored.
  Return value   None.
  Screens        All video pages and virtual screens.
  EOS            Updated.
  Restrictions   Stay within window limits.  Cannot use NO_BORDER.