I dont think you can parse variables in SSI
eg anything after the ? will not be read.
I was making a tracking system for 5.47d using SSI so it would show users where ever they are on my site in the who's online.
I was trying to parse variables in my ssi call, eg. /ubbcgi/online.cgi?where=OnHomePage
But it didnt work. I ended up haveing to make seperate CGI scripts and hard code in the location of where it was being called from.