To enable UPnP click the checkbox. UPnP is a function that allows the gateway to self-discover, self configure and communicate easily with one another. Some software requires the UPnP enabled to open ports for connection, please refer to the software manual. Windows XP includes a native UPnP capability. The gateway will appear as an icon at the right down corner on your screen. Double click it, you can manage the gateway via UPnP.