Not that I know why one would want to use SSI to execute another CGI program from a CGI generated page (I mean you can do all of that with what is built into Links), but you can use SSI, if you hack the PERL code with something like this for example:

$output = qq~
<A HREF="< ! --# echo var="HTTP_REFERER"-->">Go Back</A>~ (spaces inserted so you can see command)

If this simple ECHO call works (and it does) then I don't see why all the other SSI commands wouldn't work.