Prevents any data from being sent to a web browser, including white space, spaces, tabs, and line breaks. This is useful for situations when you need to use the COOKIE or HEADER keywords, because those keywords must be processed before any template data is sent. Use the OUTPUT keyword to enable the sending of template data to the web browser.
The following template excerpt shows how to use the NOOUTPUT and OUTPUT keywords:
{NOOUTPUT}
{HEADER "pragma" "no-cache"}
{OUTPUT}
. . .