<html><head><title>The Common Gateway Interface Specification [http://hoohoo.ncsa.uiuc.edu/cgi/interface.html] </title></head><body><h1><img alt="" src="interface_files/CGIlogo.gif"> The CGI Specification</h1> <hr> This is the specification for CGI version 1.1, or CGI/1.1. Further revisions of this protocol are guaranteed to be backward compatible. <p> The server and the CGI script communicate in four major ways. Each of the following is a hotlink to graphic detail.</p><p> </p><ul> <li> <a href="env.html">Environment variables</a> </li><li> <a href="cl.html">The command line</a> </li><li> <a href="in.html">Standard input</a> </li><li> <a href="out.html">Standard output</a> </li></ul> <hr> <a href="http://hoohoo.ncsa.uiuc.edu/cgi/overview.html"><img alt="[Back]" src="interface_files/back.gif">Return to the overview</a> <p> CGI - Common Gateway Interface </p><address><a href="http://hoohoo.ncsa.uiuc.edu/cgi/mailtocgi.html">cgi@ncsa.uiuc.edu</a></address> </body></html>