Tells the application that it should transition into or out of context sensitive help mode. This member should implement the functionality described for IOleInPlaceSite::ContextSensitiveHelp (as described in the OLE documentation).
HRESULT ContextSensitiveHelp(
  BOOL fEnterMode  
);
 Returns success status.
  Windows NT: Requires version 3.1 or later.
  Windows: Requires Windows 95 or later.
  Windows CE: Unsupported.
  Header: Declared in richole.h.
Rich Edit Controls Overview, Rich Edit OLE Interfaces, IRichEditOleCallback