The Fat client reference article from the English Wikipedia on 24-Jul-2004
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Fat client

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In computing, a Fat Client (also known as Rich-Client) is a term from client-server architecture for a client that performs the bulk of the data processing operations. The data itself is stored on the server. See thin client for contrast and for a more in-depth discussion.

Although the term usually refers to software, it can also apply to a network computer that has relatively strong processing abilities.