apache2 includes a default CGI directory in /usr/local/apache2/cgi-bin/
Perl is installed by default on the N810 (not all the libraries that you get on
a desktop install, but the basic stuff).
I could quite easily write a perl CGI to respond to imagemap clicks (mapping WiFi channels
with iwlist by clicking on a floorplan on http://localhost/cgi-bin/plan.pl)