Hi rtlm,

How about using exec?

<!--#exec cgi="/cgi-bin/counter.cgi" -->
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Do read the following for its usage though (source->http://www.tech.irt.org/articles/js099/):

I have saved this one (exec) for last, since it is probably the most powerful but also the most dangerous. With it, the output of a CGI script may be included where the SSI is in the HTML page. The CGI script may do just about anything - it could be a counter, perhaps, which updates your counter file and displays the number of visitors on the page. It takes two different parameters, cmd and cgi.