code: protected final void fireMemberJoined(AgentContext newJoinedContext) {
  		final EventSpace defSpace = newJoinedContext.getDefaultSpace();
  		defSpace.emit(
  				// No need to give an event source because the event's source is explicitly set below.
  				null,
  				new MemberJoined(defSpace.getAddress(getOwner().getID()), newJoinedContext.getID(), getOwner().getID(),
  				getOwner().getClass().getName()));
  	}
docs: Fires an {@link MemberJoined} event into the newly joined parent Context default space to notify other context's members
  that a new agent joined this context.
  
  @param newJoinedContext the newly joined context to notify its members