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Theo van Veen wrote: > I missed this point. Are reference id's used by the client to keep session context or by the server? Z39.50 reference ids, and session ids, are so different that I hesitate to prolong any discussion of reference ids. Sorry I raised the comparison. But in answer to your question, they aren't used to keep session context, if by session you mean Z-association. Rather, they are used to keep operation context (by both the client and server) and are useful when there are concurrent operations (more than a single concurrent operation within a z-association, see 3.4 and 3.5 of the standard). Their usefulness outside of concurrent operations is undefined by the standard. --Ray