* '''displayName''' - The user-friendly name that should be displayed for this participant
* '''account''' - If the user is logged in, this is the FxA account name or MSISDN that was used to authenticate the user for this session
id''' - An id, unique within the room for the lifetime of the room, used to identify a participant ''for the duration of one instance of joining the room''. If the user departs and re-joins, this id will change. Note that this document uses a UUID in its examples, since they can be used in this fashion without having to store additional state; however, anything that is unique within a room for its entire lifetime (e.g., a constantly increasing integer) would be suitable as well.
== Room Size Handling ==