Code that resides on a server to help process Web form input. Server-side CGI scripts commonly written in Perl.
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Client-side Script
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Code embedded into an HTML page and downloaded by a user; resides on the client and helps process Web form input. Common client-side scripting languages include JavaScript and VBScript.
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Computer Gateway Interface (CGI)
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A program that processes data submitted by the user. Allows a Web server to pass control to a software application, based on user request. The application receives and organizes data, then returns it in a consistent format.
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CAPTCHA
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Completely Automated Public Turing Test to Tell Computers and Humans Apart, good way to prevent users from submitting spam in Web forms.
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FormMail
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One example of a popular CGI script is the FormMail script, written by Matt Wright in Perl. Existed in various versions since 1997. FormMail.pl