While the focus of this paper is on using ROAM for network layer mobility, ROAM also provides support for personal/session mobility (Section 2). Personal/session mobility requires tracking the set of active devices for a user and routing to the optimal device. Devices register themselves for a particular person whenever they detect an authorized user is nearby (e.g., devices have Bluetooth transceivers and users carry Bluetooth smart cards) [28]. Devices register by setting a trigger with an identifier representing that user. Given multiple simultaneously registered devices, the devices follow an agreement protocol to decide which one will handle a particular session (e.g., the least expensive one or the highest performing one). Leveraging the ROAM infrastructure for personal/session mobility removes the cost of deploying infrastructure specific to any particular application or personal/session mobility scheme.