Gets a reference to the XllOpen event
CXllOpenEvent& XllOpenEvent( );
The function returns a reference to the application's XllOpen event, which is of type CXllOpenEvent.
When observers are notified, an argument of type CXllOpenEventArgs is passed.
Observers should register for this event early in the life of the XLL. Registration can be done explicitly during CXllApp::InitInstance, or automatically by creating an instance of CXllOpenEventStaticObserver.