Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Ad Loc is a system for mobile-device users to collaboratively tie persistent virtual notes to physical locations without the need for any servers embedded in the environment or accessed via the Internet. Instead, all notes are proactively cached solely on the mobile devices of passing participants and served up to others in the vicinity via ad hoc wireless protocols like Wi-Fi. By making use of any of the increasingly ubiquitous positioning technologies, such as GPS, devices attempt to ensure notes remain cached at the physical locations they were published.

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