private void handleShutdown() {
        orb.removeMethod(m_list);
        orb.removeMethod(m_unreg);
        if (req != null) {
            req.abort();
            req = null;
        }
        if (target != null) {
            target.close();
            target = null;
        }
    }
Invoked from the transport thread, requested by the shutdown
method.
jrt/src/com/yahoo/jrt/slobrok/api/Register.java