Online GUID and UUID generator is a free web application for generating GUID and UIID
Short for Globally Unique Identifier (Universally Unique Identifier (UUID)), a unique 128-bit number that is produced by the Windows OS or by some Windows applications to identify a particular component, application, file, database entry, and/or user. For instance, a Web site may generate a GUID (UUID) and assign it to a user's browser to record and track the session. A GUID (UUID) is also used in a Windows registry to identify COM DLLs. Knowing where to look in the registry and having the correct GUID (UUID) yields a lot information about a COM object (i.e., information in the type library, its physical location, etc.). Windows also identifies user accounts by a username (computer/domain and username) and assigns it a GUID (UUID). Some database administrators even will use GUIDs (UUIDs) as primary key values in databases. GUIDs (UUIDs) can be created in a number of ways, but usually they are a combination of a few unique settings based on specific point in time (e.g., an IP address, network MAC address, clock date/time, etc.).