Use these GUIDs at your own risk! No guarantee of their uniqueness.
GUID (or UUID) is an acronym for "Globally Unique Identifier" (or "Universally Unique Identifier"). It is a 128-bit integer number used to identify resources. The term GUID is also used, typically in software created by Microsoft.
The "nil" UUID, a special case, is the UUID 00000000-0000-0000-0000-000000000000; that is, all bits set to zero