device capabilities. A Rover system represents a single domain of administrative control, managed and moderated by a Rover controller. Figure 1 shows a large application domain partitioned into multiple administrative domains, each with its own Rover system---much like the Internet's Domain Name System. 2 End users interact with the system through Rover client devices---typically wireless handheld units with varying capabilities for processing, memory and storage, graphics and display, and network interfaces. Rover maintains a profile for each device, identifying its capabilities and configuring content accordingly. Rover also maintains end-user profiles, defining specific user interests and serving content tailored to them. A wireless access infrastructure provides connectivity to the Rover clients. In the current implementation, we have defined a technique to determine location based on certain properties of the wireless access infrastructure. Although Rover ca
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