docs: public SessionInfo popWaitlistSession(Object bookmark)
      {
      	Vector<SessionInfo> vector = m_htWaitLists.get(bookmark);
      	if (vector == null)
      		return null;
      	SessionInfo sessionInfo = vector.remove(0);
      	if (vector.size() == 0)
      		m_htWaitLists.remove(bookmark);
      	return sessionInfo;
      }