[Session] SID automatically add on all pages?

Hi people, Just a question, I'm building components for a customer who wants some interactivity within his site, but still wants to build the site himself. One thing that would be interesting would be Session management. Now, if I just tell him to make all his own pages with .php ext instead of .html, would did be enough if --enable-trans-sid is used (and php.ini is correctly configured)? It seems to work here, but I want to know if I forgot something important... -- Kind regards, Tim