public function getSessionIdFromCookie()
	{
		// get session id key name
		$client = 'site';
		if (isset($_SERVER['HTTP_REFERER']) && $_SERVER['HTTP_REFERER'])
		{
			$referrer = $_SERVER['HTTP_REFERER'];
			if (\Hubzero\Utility\Uri::isInternal($referrer))
			{
				if (substr($referrer, 0, strlen('http')) == 'http')
				{
					$referrer = parse_url($referrer, PHP_URL_PATH);
				}
				$referrer = trim($referrer, '/');
				$parts = explode('/', $referrer);
				$referrer = array_shift($parts);
				if ($referrer == 'administrator')
				{
					$client = $referrer;
				}
			}
		}
		$sessionName = md5(\App::hash($client));

		// return session id stored in cookie
		return (!empty($_COOKIE[$sessionName])) ? $_COOKIE[$sessionName] : null;
	}