>ValueChanged</b></td>
      <td width=432 valign=top class="TableText">Sent
        when a value associated with a node has changed.
        Receipt of
        this notification indicates that it may be a good time to read the new value
        and display or otherwise process it accordingly.</td>
    </tr>
    <tr>
      <td width=151 valign=top class="TableText"><b>ValueRemoved</b></td>
      <td width=432 valign=top class="TableText">Sent
        when a value associated with a node has been removed.</td