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OPC-10000-4 – OPC Unified Architecture - Part 4: Services5.7.2.1 DescriptionThis SecureChannel has a unique identifier which the Server shall associate with the a uthenticationToken . The Server may accept requests with the a uthenticationToken only if they are associated with ... SecureChannel used to send a request. Clause 7.35 describes how to create the a uthenticationToken for different types of Communication Stack . Depending upon on the SecurityPolicy and the SecurityMode