 for a particular application context.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>layer</code> - A String identifying the message layer
                for the returned ServerAuthConfig object.
          This argument must not be null.</dd>
<dd><code>appContext</code> - A String that identifies the messaging context 
          for the returned ServerAuthConfig object.
          This argument must not be null.</dd>
<dd><code>handler</code> - A CallbackHandler to be passed to th