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What is a CGI program? How does one get invoked?
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What is a CGI program? How does one get invoked?
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(Common Gateway Interface script) A small program written in a language such as Perl, Tcl, C or C++ that functions as the glue between HTML pages and other programs on the Web server. For example, a CGI script would allow search data entered on a Web page to be sent to the DBMS (database management system) for lookup. It would also format the results of that search as an HTML page and send it back to the user. The CGI script resides in the server and obtains the data from the user via environment variables that the Web server makes available to it.
CGI scripts have been the initial mechanism used to make Web sites interact with databases and other applications. However, as the Web evolved, server-side processing methods have been developed that are more efficient and easier to program. For example, Microsoft promotes its Active Server Pages (ASPs) for its Windows Web servers, and Sun/Netscape nurtures its Java roots with JavaServer Pages (JSPs) and servlets
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