Ordinarily, GUIDs are generated based on information taken form the hardware on which the algorithm is run.
This includes node id, the clock resolution, the current time etc.
The algorith used on this page is NOT guaranteed to be a genuine GUID in this respect, however the GUID DOES conform to RFC 4122 for randomly generated UUID's.
See section 4.4 of RFC 4122 for more information on the algorithm for
creating a UUID from truly random or pseudo-random numbers: