????? ???? ????? (GUID? Globally Unique Identifier) ?? ????? ???? ??? ?????? ?????? ???????? ???? ????? ???? 128 ??. ??????? GUID ???? ????? ?? ??????? ?? ??????? ???? ????? ??? ??? ???? ???? ????? ?????. ?? ???? ???????? ?? ???? ?? ???? ????? ?? ??? ?? ??????? ?????? GUID ????. ?????? ??? GUIDs ??? ??? 2^128 (3.4×10^38)? ??? ??? ???????? ????? GUID ???? ???? ?????? ????? ????? ????? ???? ?????. ???? ????? GUID ??????? ??? ????? Microsoft ?????? UUID.