Programmers who build applications for a distributed computing environment follow a simple guideline: they try to make each distributed application behave as much as possible like the nondistributed version of the program. In essence, the goal of distributed computing is to provide an environment that hides the geographic location of computers and services and makes them appear to be local.
For example, a conventional database system stores information on the same machine as the application programs that access it. A distributed version of such a database system permits users to access data from computers other than the one on which the data resides. If the distributed database applications have been designed well, a user will not know whether the data being accessed is local or remote.
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