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Learn how to manage your AOL username. Your AOL username is the unique identity that gives you access to services like AOL Mail or premium services. For AOL email addresses, your username is the first part of the email address before the @ symbol. For non-AOL email addresses, your username is the entire email address.
Unix-like operating systems identify a user by a value called a user identifier, often abbreviated to user ID or UID. The UID, along with the group identifier (GID) and other access control criteria, is used to determine which system resources a user can access. The password file maps textual user names to UIDs.
A user is a person who utilizes a computer or network service. A user often has a user account and is identified to the system by a username (or user name ). Other terms for username include login name, screenname (or screen name ), account name, nickname (or nick) and handle, which is derived from the identical citizens band radio term.
In computing, the superuser is a special user account used for system administration. Depending on the operating system (OS), the actual name of this account might be root, administrator, admin or supervisor.
Internet identity ( IID ), also online identity, online personality or internet persona, is a social identity that an Internet user establishes in online communities and websites. It may also be an actively constructed presentation of oneself.
A unique identifier ( UID) is an identifier that is guaranteed to be unique among all identifiers used for those objects and for a specific purpose.  The concept was formalized early in the development of computer science and information systems. In general, it was associated with an atomic data type .
Single sign-on ( SSO) is an authentication scheme that allows a user to log in with a single ID to any of several related, yet independent, software systems. True single sign-on allows the user to log in once and access services without re-entering authentication factors.