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The CLSID or Class Identifier is a string of alphanumeric (both numbers and alphabet characters) symbols that are used to represent a specific instance of a Component Object Model or COM-based program.
To use the System Device Enumerator, do the following: Create the system device enumerator by calling CoCreateInstance. The class identifier (CLSID) is CLSID_SystemDeviceEnum. Obtain a category enumerator by calling ICreateDevEnum::CreateClassEnumerator with the CLSID of the desired category.