Link Layer Topology Discovery (LLTD) Responder

 The network map on a computer running Windows 7 and Windows Vista shows a graphical view of the computers and devices on your network and how they are connected by using the LLTD protocol. The LLTD responder must be installed on a computer running Windows XP before it can be detected and appear on the network map. After you install this item, you may have to restart your computer. Google the knoledge base KB922120 to download the LLTD for windows XP SP2.