Users are grouped according to their group names session ID in iOS development terms).
By default, all devices from our group share the same group name of "
Other groups attending the conference can use their own group names to establish intra-group messaging.
A user can generate generic messages or ones specific to a poster.
In either case, these messages are intended for all other group members.
To do this, the app uses the Bluetooth radio on the iPhone to achieve short-range wireless communication. Since it does not rely on any infrastructure at the conference venue, such as Wi-Fi access points or cellular base-stations, it can function in a wider scope of settings. The Bluetooth radio on-board of the iPad has a transmission range of up to 100 meters in a not-so-"noisy" environment. At conference venues, however, its range will be a fraction of that. In general, two devices can be out of range of each other frequently, depending on where the users are and how they move. Thus, a device will "mechanically" transport messages from one location to another as its user moves around. When the app detects other group members within range, it swaps messages with them. As a result, a message propagates among devices belonging to the same group until it reaches everybody. Apparently, messages delivered as such are not "instant".