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<p>In many popular visions of ubiquitous computing, the environment proactively responds to individuals who inhabit the space. For example, a display magically presents a personalized advertisement, the most relevant video feed, or the desired page from a secret government document. Such capability requires more than an abundance of networked displays, devices, and sensors; it relies implicitly on recommendation systems that either directly serve the end user or provide critical services to some other application.</p>

S. J. Vaughan-Nichols, "Presence Technology: More than Just Instant Messaging," in Computer, vol. 36, no. , pp. 11-13, 2003.
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