public function setLoginTarget(CNabuSiteTarget $nb_site_target)
    {
        $nb_site = $this->nb_engine->getHTTPServer()->getSite();
        if ($nb_site instanceof CNabuSite) {
            return $nb_site->setLoginTarget($nb_site_target);
        } else {
            throw new ENabuCoreException(ENabuCoreException::ERROR_SITE_NOT_INSTANTIATED);
        }
    }