DEFAULT_USER holds the default user name given to AcuConnect requesters who are not specifically mapped to a local user name in the server access file (as when the Local Username field of the access record is empty, or the value of the field is an invalid user name). Definition of DEFAULT_USER is optional. DEFAULT_USER cannot be defined as root on UNIX systems or administrator on Windows systems. See AcuConnect Connection Logic for a description of when AcuConnect assigns DEFAULT_USER to a requeste.