New concepts for human-computer interaction have to be developed when envisioning ubiquitous computing scenarios . Instead of a single screen-based user interface (UI), humans will interact with a number of devices that are distributed and interconnected. These computers range from highly personal and mobile appliances to systems that are integrated in everyday environments and are more or less invisible. When all the potential components are considered together, the design space for the UI becomes much larger than with conventional personal computers. In the process of designing UIs, decisions on the distribution of the input as well as the output through both space and time are needed. This also raises questions on how to deal with alternative, multiple input options, redundant output opportunities, and the fact that many of these UIs cannot expect to have people's attention for a long time.
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