Summary: UPnP network technology allows personal computer and consumer electronics devices to advertise and offer their services to network clients. Many companies and standards organizations view UPnP as the technological foundation of the digital home, enabling innovative usage models, higher levels of automation, and easier integration of devices from different manufacturers. In this article, Michael Jeronimo provides an introduction to UPnP technology, reviews the protocols that comprise UPnP, and explains the various elements of a UPnP device.