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

String that identifies the user of the client requesting an action

Note 1to entry: The ClientUserIdis obtained directly or indirectly from the UserIdentityTokenpassed by the Clientin the ActivateSession Servicecall or from the authenticationTokenin the requestHeader ofaSessionlessInvoke Service call. See 6.4.3for details.