|Microsoft Internet Security and Acceleration Server 2000|
Sets the callback for the completion of the overlapped I/O.
HRESULT SetNotificationInterface( IFWXExternalIOCompletion *piExternalIOCompletion, UserContextType UserData );
The UserData parameter provides a context to the notification. You can use the same notification interface for completion notifications from distinct network socket objects and differentiate between them by using different values for UserData.