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• OPC-10000-4 – OPC Unified Architecture - Part 4: Services
  7.31 RegisteredServer
  LocalDiscoveryServer starts. If a Semaphore file is specified but does not exist the Discovery Server shall remove the registration from any persistent data store. If the Server has registered with ... semaphoreFilePath, the Discovery Server shall check that this file exists before returning the ApplicationDescription to the Client . If the Server did not register with a semaphoreFilePath (it is null