The PXE is shipped with one built-in user profile: admin, which is used for initial login and configuration. This profile has full permissions, and should be reserved for the system administrator. It cannot be deleted and its permissions are not user-configurable except for the SNMP v3 permission.
All users must have a user profile, which specifies a login name and password, and contains additional (optional) information about the user. Every user profile must have at least a role to determine the user's permissions. See Setting Up Roles.
Tip: By default, multiple users can log in simultaneously using the same login name.