This is a UUID (A.K.A. GUID) generator that generates standard UUIDs (i.e. f19b32ec-cfaf-32ee-35b9-37435f4bef3f) and stores the new UUID in the UUID environmental variable (i.e. %UUID% or !UUID!), ...

GUID (Globally Unique Identifier) is the general concept, widely used in Microsoft technologies. UUID (Universally Unique Identifier) is a standardized implementation of GUID, with defined versions ...