* resource refers to a workgroup in a <code>smb://workgroup/</code> URL,
     * <li>all browseable shares of a server including printers, IPC
     * services, or disk volumes if this resource is a server URL in the form
     * <code>smb://server/</code>,
     * <li>or <code>null</code> if the resource cannot be resolved.
     * </ul>
     *

 * </tt>
 * The <tt>Principal</tt> object returned will never be <tt>null</tt>
 * however the username can be <tt>null</tt> indication anonymous
 * credentials were used (e.g. some IPC$ services).
 */

    public Principal getPrincipal() {
        return auth;
    }

/**
 * Returns the last component of the target URL. This will