UUIDVariants Category

The global constants for specifying the layout of a generated Universally Unique Identifier (UUID) are listed in the following table.

Global Constant	Integer Value	Description
VariantDce	2	Distributed Computing Environment, which is the scheme used by Qt C++ application development framework, and which is the recommended variant to pass to the generateUuid method.
VariantMicrosoft	3	Generates a UUID using CoCreateGuid, which .NET Guid.NewGuid() also uses.
VariantNcs	1	Reserved for NCS (Network Computing System) backward compatibility.