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Ubiquitous computing applications have been enabled by a tight embedding of computation to the environment, support for dynamic networks, and the physical distribution of application components. Applications respond to frequent changes, detected through persistent monitoring of the environment in domains such as construction sites, where maintaining safety is essential; in military applications where asset management is important; and in home networks that monitor intrusions and energy consumption. Programming applications that monitor such open and rapidly changing networks can be challenging. A persistent query can simplify the development of applications that require continuous monitoring.
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