Errata exists for this version of the document.

For the purposes of this document, the terms and definitions given in OPC 10000-1 and OPC 10000-3, as well as the following apply.

String that identifies the user of the client requesting an action

Note 1 to entry: The ClientUserId is obtained directly or indirectly from the UserIdentityToken passed by the Client in the ActivateSession Service call. See 6.4.3 for details.