At CERN (the European Particle Physics Laboratory) large numbers of minicomputers, workstations, and microprocessors embedded in complex VME and FASTBUS based systems are used for data acquisition and the control of particle physics experiments. The design of distributed software to run on many different types of processor and operating systems has provoked the development of an infrastructure based on Remote Procedure Call, and of many related tools and applications. In this paper, we describe briefly the principles of RPC, and then discuss some typical uses to which it has been put at CERN.

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