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This document discusses ubiquitous user interaction with technology. It notes that people's activities are supported by many devices and software, and that devices are capable of sensing context. However, devices and services are still often designed in isolation. It lists various sensors in devices like cameras, GPS, and accelerometers. The document introduces ubiquitous computing and ubiquitous interaction, which studies design and evaluation of interactive systems for ubiquitous and mobile computing. It recommends further reading on defining a research agenda for this emerging interaction paradigm.