A player's Member Address (メンバーアドレス, Menbā Adoresu) is their unique identifier in The World and The World R:2. This address is used for basic communications, including Flash Mail, as well as some minor offline communication. Most importantly, however, it is used for inviting others to join in a party and venture into The World. In The World R:2 Member Addresses also list a player's online or offline status. Players who are online but do not wish to be bothered can also list their member address as "busy".