GUID is a 128-bit global unique identifier (GUID - global unique identifier), and GUID is a 128-bit binary (16 bytes) composition that can be used for all computers and networks that require a unique identifier. The possibility of repetition of this identifier is very small. The GUID format is "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx " xx is a hexadecimal number within 0-9 or a-f.