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The Concept Map you are trying to access has information related to: Chapter 5 Summary, Summary RMI Each object has a (global) remote object reference and a remote interface that specifies which of its operations can be invoked remotely. Local method invocations provide exactly-once semantics; the best RMI can guarantee is at most-once. Middleware components (proxies, skeletons and dispatchers) hide details of marshalling, message passing and object location from programmers, Summary External Data Representation and marshalling CORBA marshals data from use by recipients that have prior knowledge of the types of its components. It uses an IDL specification of the dat types, Summary Heterogeneity is an important challenge to designers: Distributed systems must be constructed from a variety of different networks; operating systems, computer hardware and programming languages.