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• OPC-10000-4 – OPC Unified Architecture - Part 4: Services
  6.6.2.2 RedundantServerSet Requirements
  considerations for a redundant system regarding synchronization: EventIds: Each UA Server in a Transparent ( 6.6.2.3 ) and HotAndMirrored ( 6.6.2.4.5.5 ) RedundantServerSet shall synchronize EventIds to prevent a Client from mistakenly processing ... change, in that Clients shall be prepared for lost continuation points. Servers in Transparent and HotAndMirrored Redundancy sets shall synchronize continuation points and they may do so in other modes