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A presence and instant messaging system allows users to subscribe to each other and be notified of changes in state, and for users to send each other short instant messages. Now, presence is being taken to the next level by creating a framework for merging users' location data into their presence information. The concept that location can influence health is well known in medicine. Caregivers need to know not only the history of patients they treat but also information about the social and environmental context within which those patients live.
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