prise.authentication.mechanism.http"><code>HttpAuthenticationMechanism</code></a>).

 <p>
 Whether the authentication dialog is to be started or continued depends on the (logical) state of the authentication dialog. If
 such dialog is currently in progress, a call to this method will continue it. If such dialog is not in progress a new one will be
 started. A new dialog can be forced to be started regardless of one being in progress or not by providing a value of
 <code>true</code> for the <a href="../../..