The different middleware technologies studied in this book allow inter- and intraapplication inter-operability. Typically, for a given application composed of distributed elements, the RPC and ORB technologies are used. When there are several existing applications which must co-operate, the technologies of message queue, transaction monitor or ORB are used. A company can have a specific strategy for a critical application, and in parallel develop a strategy for their range of software in order to ensure coherence in the processing of data in a heterogeneous environment.
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