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──Microsoft Foundation OLE Classes──────────────────────────────────────────
  protected:
      virtual void OnChange( OLE_NOTIFICATION <wNotification> ) = 0;
 
  Parameter       Description
 
  <wNotification> Reason the server changed this item. Must be one of the
                  following:
 
                  Value         Meaning
 
                  OLE_CHANGED   The server item's state has changed (as
                                from editing).
 
                  OLE_SAVED     The server document that contains this
                                item was saved.
 
                  OLE_CLOSED    The server document that contains this
                                item was closed.
 
  Remarks
 
  This is a pure virtual callback function that you must implement in your
  derived class. It is called by OLECLI.DLL when the server changes an OLE
  item.
 
  In general, do not redraw the client item when you get the OnChange
  callback, but instead post an update message or use CWnd::InvalidateRect
  for the window.
 
 
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