Your account is capable of supporting the use of SSIs. For the system to process the include you must save the page with a .shtml or .sht extension rather than .htm or .html.
Sample SSI is <!--#exec cgi="/cgi-bin/count.cgi"-->
Please note as shown in the example above, the URL must be relative and not a full call, this would not work
<!--#exec cgi="http://yourdomain.com/cgi-bin/count.cgi"-->
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