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User identifier. 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.
Security Identifier. In the context of the Microsoft Windows NT line of operating systems, a Security Identifier (SID) is a unique, immutable identifier of a user, user group, or other security principal. A security principal has a single SID for life (in a given domain), and all properties of the principal, including its name, are associated ...
A Universally Unique Identifier (UUID) is a 128-bit label used for information in computer systems. The term Globally Unique Identifier (GUID) is also used, mostly in Microsoft systems. [1][2] When generated according to the standard methods, UUIDs are, for practical purposes, unique. Their uniqueness does not depend on a central registration ...
1-800-358-4860. Get live expert help with your AOL needs—from email and passwords, technical questions, mobile email and more. 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 ...
Unique identifier. 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. [1] The concept was formalized early in the development of computer science and information systems. In general, it was associated with an atomic data type.
An access token is used by Windows when a process or thread tries to interact with objects that have security descriptors (securable objects). [2] In Windows, an access token is represented by the system object of type Token. An access token is generated by the logon service when a user logs on to the system and the credentials provided by the ...
In Unix systems, the username is correlated with a user identifier or user ID. Computer systems operate in one of two types based on what kind of users they have: Single-user systems do not have a concept of several user accounts. Multi-user systems have such a concept, and require users to identify themselves before using the system.
Personal identification number. A personal identification number (PIN), PIN code, or sometimes redundantly a PIN number, is a numeric (sometimes alpha-numeric) passcode used in the process of authenticating a user accessing a system. The PIN has been the key to facilitating the private data exchange between different data-processing centers in ...