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In the past decade, there have been numerous efforts in ubiquitous. computing. For home networks, we believe that ubiquitous computing requires a global-scale system that is securable, administered by, multiple independent nonspecialist administrators, and integrates off-the-shelf hardware and software. In this system every home owner acts as an administrator of the network in the home. We are developing such a system based on the Session Initiation Protocol (SIP), with Bluetooth devices for location sensing and the Service Location Protocol (SLP) for service discovery. We also introduce context-aware location information to augment device discovery bind user communication. The system builds on our CINEMA infrastructure.