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Reference

What Is a Globally Unique Identifier?

A globally unique identifier (GUID) is an identifier that distinguishes one program or object from another. When using the IEAK, you can generate a GUID for your custom program.

A GUID, sometimes known as a UUID (universally unique identifier), is generated using an algorithm defined by the Open Systems Foundation to guarantee uniqueness.

The number is based on various identifiers, such as the time of day, and system information. The same number is never produced twice. If your computer contains a network card with a 48-bit IEEE network card hardware address, this globally unique address will be incorporated into the GUID. Otherwise, a random pseudo-address is created from computer-state information.