Context-aware computing applications

Describes systems that examine and react to an individual´s changing context. Such systems can promote and mediate people´s interactions with devices, computers and other people, and they can help navigate unfamiliar places. We believe that a limited amount of information covering a person´s proximate environment is most important for this form of computing, since the interesting part of the world around us is what we can see, hear and touch. In this paper, we define context-aware computing and describe four categories of context-aware applications: proximate selection, automatic contextual reconfiguration, contextual information and commands, and content-triggered actions. Instances of these application types have been prototyped on the PARCTAB, a wireless palm-sized computer