Distributed computing is a method of computer processing in which different parts of a program run simultaneously on two or more computers that are communicating with each other over a network. Distributed computing is a type of segmented or parallel computing. But the latter term is most commonly used to refer to processing in which different parts of a program run simultaneously on two or more processors that are part of the same computer. While both types of processing require that a program be segmented—divided into sections that can run simultaneously, distributed computing also requires that the division of the program take into account the different environments on which the different sections of the program will be running

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Distributed system in genral refers to n/w o.s in which various systems (computers) are connected to sharing some of resources like printer etc. Each system have own data (including files etc) and whenever access over other's system data is required FTP (file transfer protocal) is used. One must have login and password to access remote files..some systems also support annonymous FTP.
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