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• OPC-10000-4 – OPC Unified Architecture - Part 4: Services
  5.7.2.1 Description
  Session . The Client may associate a new SecureChannel with the Session by calling ActivateSession. For the N Sessions supported by a Server, the Server shall support N+1 SecureChannels ... Session created with this Service shall not be used until the Client calls the ActivateSession Service and proves possession of its ApplicationInstanceCertificate and any user identity token that it provided