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Globally unique identifier (GUID) is a unique reference number used as an identifier in computer software. In Unreal Engine, it may refer to:

  • struct GUID - built-in struct type in UE1, UE2, and UE3.
  • Package GUID. Every package in engine has a GUID, which is used in network games to ensure that clients have the same package version as the server does. Conforming process can make different package versions network-compatible, but has its own nuances. More information is available on UDN [1].
  • Guid(A, B, C, D) class modifier. It was intended to be used with COM, but wasn't actually implemented.