This tests cookie testing, upon which decisions about what to output can be made. The core of the code is:

<!--#if expr="$HTTP_COOKIE" -->
<FONT SIZE="4">You have a cookie set: </FONT><!--#echo var="HTTP_COOKIE" -->
<!--#elif -->
<FONT SIZE="4">You are cookieless!</FONT>
<!--#endif -->

The output of that test is:
You have a cookie set: You are cookieless!