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Server (computing) - Wikipedia, the free encyclopedia
A server is any combination of hardware or software designed to provide services to clients. When used alone, the term typically refers to a computer which may be running a server ...
PHP: Predefined Variables - Manual
Note that $_SERVER['QUERY_STRING'] behaves differently under IIS/Apache. In Apache (at least on Windows) it is ALWAYS set - if no query string was specified in the URL, $_SERVER ...
PHP: $_SERVER - Manual
Description $_SERVER is an array containing information such as headers, paths, and script locations. The entries in this array are created by the web server.

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Server

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Server, in computer science, a computer that supplies services or data to other machines on a local area network (LAN) or a wide area network (WAN) such as the Internet. Some servers run administrative software that controls access to all or part of the network and its resources (such as disk drives or printers). Others provide files, applications, or World Wide Web pages. Computers that request services or data from a server are known as clients. See also Client/Server Architecture.

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