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Line 7: Xerox developed the PARCTab as an early experiment in [[Ubiquitous Computing]], also called "UbiComp".<ref>{{Cite web \|title=Detail \|url=https://www.microsoft.com/buxtoncollection/detail.aspx?id=51 \|access-date=2023-12-17 \|website=www.microsoft.com}}</ref> The PARCTab was similar in shape, size, and appearance to a PDA. It had a touch screen and a stylus. It had handwriting recognition. The PARCTab had infrared sensors and emitters to communicate with 'gateway nodes' that were to be installed in a ___location. The notable feature of the PARCTab was its ability to offer different fun cionality depending on where the user was using the device within the area covered by the gateway nodes.<ref name=computerhistory>{{Cite web \|title=Xerox PARCTab Prototype - PDA - Computing History \|url=https://www.computinghistory.org.uk/det/36785/Xerox-PARCTab-Prototype/ \|access-date=2023-12-17 \|website=www.computinghistory.org.uk}}</ref>

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