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  vscrollview                                                           WNDWC
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  Function       Alters the upper left viewing reference point of the current
                 virtual screen by a relative number of rows and columns.
                 The view window is also updated no matter where its location
                 even if hidden or overlapped.
  Syntax         void vscrollview( int numofrows, int numofcols );
  Remarks        The reference point may be adjusted to keep the viewing
                 window within the virtual window limits.  Works in any
                 "writeto" mode.
  Return value   None.
  Restrictions   None.
  Heap           If covered, wsrows * wcols * 5 bytes is temporarily used.