Computers have become ubiquitous, but in a different way than envisioned in the 1990s. To master the present-day ubicompa multilayered agglomeration of connections and data, distributed physically and digitally, and operating under no recognizable guiding principlesthe user must exhibit foresight, cunning, and perseverance. Preoccupation with Weiserian visions of ubicomp may have diverted HCI research toward problems that do not meet the day-to-day needs of developers. The Two Ubicomps Ubiquitous computing can be viewed from two distinct perspectives. On the one hand there is the avant-garde that gets presented in scientific conferences and follows Mark Weiser's and others' visions…
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