(1) The name used to associate the user profile with a user when a user signs on to a system.
(2) The first part of a two-part network name used in the system distribution directory and in the office applications to uniquely identify a user. The network name is usually the same as the user profile name, but does not need to be. See also common user identification.
(3) In the UNIX operating system, a string that uniquely identifies each user to the operating system.
(4) A file assigned to every user and server that uniquely identifies them to Lotus Notes and Domino.