notification object passed in to your notification-handling or notification-dispatch method.</font>

<p><font face="Times">To illustrate this, let's assume that you've added your object as an observer of a port. When that port dies, the object monitoring that port will post an &quot;NSPortInvalid&quot; notification to the Notification Center. The Notification Center then invokes the method you've registered to handle that notification:</font></td></tr>

</table>

<p><img src="../../Images/sp.gif" width=124 