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Online! The Book by Wendy Taylor, Chris Pirillo, John C. Dvorak

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The Client/Server Model

The term client/server was originally used to distinguish networked computing from the monolithic centralized mainframe model of computing. (In reality, this distinction is a moot point, because today's mainframe applications are heavily client/server and networked.) A client/server communication relationship is never equal. The computers communicate through the server program that establishes a hierarchy.

The program running on a computer can ask for and receive only a very particular and specialized type of data. The other computer will send only the data requested. Neither computer can vary from the limitations of the specific client/server program. This is a common network setup and a convenient way to interconnect ...

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