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  winsline                                                              WNDWC
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  Function       Inserts a blank line at a specified row using the window
                 attribute tws.wndwattr scrolling down the remaining part.
  Syntax         void winsline( unsigned char row );
  Remarks        Similar to Turbo C's insline, the indicated row of the
                 window is scrolled down and then cleared (SAMEATTR is
                 permitted).  The cursor is not moved, but is ready to be
                 moved with wgotoeos as EOS is set to the first column of the
                 cleared row.
  Return value   None.
  Screens        All video pages and virtual screens.
  EOS            Updated to first cleared column of the cleared row.
  Restrictions   Stay within window limits.