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I n 1991, Mark Weiser, then chief technology officer for Xerox's Palo Alto Research Center, described a vision for 21st century computing that countered the ubiquity of personal computers. "The most profound technologies are those that disappear," he wrote. "They weave themselves into the fabric of everyday life until they are indistinguishable from it." 1 Computing has since mobilized itself beyond the desktop PC. Significant hardware developments-as well as advances in location sensors,doi:10.1109/mc.2003.1185214 fatcat:jrrrojjjabeprbqayem3cus4qa