public function update( $username, $password, $host, $ip ){
		if( (int) $this->lastCheck > 0 && time() - $this->lastCheck < 10 * 60 )
			return "noop";
		$url	= "http://%s:%s@members.dyndns.org/nic/update?hostname=%s&myip=%s&wildcard=NOCHG&mx=NOCHG&backmx=NOCHG";
		$url	= sprintf( $url, $username, $password, $host, $ip );
		$this->reader->setUrl( $url );
		$parts	= explode( " ", $this->reader->read() );
		return array_shift( $parts );
	}