The base class you need to inherit from in case you want to handle Graphisoft ID change event.
    class API_IGraphisoftIDEventHandler : public API_IEventHandler {
    public:
        virtual void OnUserChanged () const;
    };
 
    
Functions
- OnUserChanged
- Override this function to be notified of user login or logout.
Requirements
- Version: API 26 or later
- Header: APIdefs_Callback.h