"The Computer for the 21st Century" , the 1991 essay by Mark Weiser in which he introduced his vision of ubiquitous computing (ubicomp), has firmly emerged as one of the most impactful writings in computer science from the past several decades. Looking back, it is hard not to be in awe of the incredible accuracy with which he anticipated future technological advances—for example, the recent talk of a "post-PC era" is all but an exact echo of Weiser's words. Weiser offers the following succinct description of the essence of his vision: "The 'virtuality' of computer-readable data—all the different ways…
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