S. Streng (Germany), D. Guinard (Switzerland), H.-W. Gellersen (UK), and A. Schmidt (Germany)
Location-aware applications, spatial conditions, mobile in teraction, proactive computing, mobile HCI.
The position of a user with respect to devices or the rela tive position of multiple devices provides an indication of interaction that is intended by the user. Based on this as sumption many applications proactively trigger an action when certain spatial conditions are fulfilled. A typical ex ample is executing a local service when the proximity of a user is detected. This paper presents a concept of spatial conditions which aims to unitize the handling of such mechanisms. The concept is integrated in a toolkit that supports applica tions in making use of it. Furthermore we propose a new interaction technique for mobile devices, which is based on spatial conditions but at the same time avoids the distur bance of users by triggering unwanted services.
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