Set the runtime configuration variable CGI_AUTO_HEADER to "0" (off, false, no) if you want to suppress the output of the HTML header. This can be useful when you want to execute a CGI program and include its output into an existing flow of HTML text. For example, with server-side includes (SSI), you can instruct the Web server to execute a subprogram in the manner of CGI and incorporate its output right into the HTML document before sending it to the requesting client. SSIs are commands in an HTML document that are interpreted by the Web server. They are used when you want to include the contents of another file in the current HTML document or to execute a script whose output will be included in the current HTML document before being sent to the browser client. Refer to any HTML documentation for information on using SSIs.