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
. 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.
Ad Loc takes its name from the abbreviation of the Latin phrase Ad Locum meaning "To/At the place/location." Which describes the approach of Ad Loc, aiming to cache data at the location it is relevant.
Ad Loc can be categorised in the following ways:
- Localised: notes are specific to physical locations.
- Persistent: notes remain in the environment.
- Asynchronous: notes are published and retrieved without requiring the concurrent presence of both publishers and consumers.
- Collaborative: anyone can publish or read any notes.
- Infrastructure-free: no servers or Internet connections are requried.