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  vupdateview                                                           WNDWC
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  Function       Updates the current virtual window view.  It is also updated
                 no matter where its location even if hidden or overlapped.
  Syntax         void vupdateview(void);
  Remarks        This routine updates the full view of the window.  Works in
                 any "writeto" mode.
  Return value   None.
  Heap           If covered, wsrows * wcols * 5 bytes is temporarily used.