protected boolean storeRegistrationID(Sim_event ev, List list)
    {
        boolean result = false;
        if (ev == null || list == null) {
            return result;
        }

        Object obj = ev.get_data();
        if (obj instanceof Integer)
        {
            Integer id = (Integer) obj;
            list.add(id);
            result = true;
        }

        return result;
    }