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  vviewrc                                                               WNDWC
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  Function       Alters the upper left viewing reference point of the current
                 virtual window.
  Syntax         void vviewrc( unsigned char row, unsigned char col );
  Remarks        The reference point may be adjusted to keep the viewing
                 window within the virtual window limits.  Works in any
                 "writeto" mode.  It does not update the viewing window.
  Return value   None.
  Restrictions   None.