appContext
 identifier differ from the previous use.
 
 <P>
 When a SecurityManager is enabled, and before making any changes to the factory, this method must confirm that the
 calling access control context has been granted the <a href="#providerRegistrationSecurityPermission"><code>providerRegistrationSecurityPermission</code></a></div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>provider</code> - The AuthConfigProvider to be registered at the factory (or null). Calling this method