Are the "included" files mod_perl routines? How are you calling them? The best way to do it is to have the children called with $r passed to them but I'd need more details before I can help you. Are you just using Apache::Registry to pimp up CGIs or are you doing stuff with your own handlers or are you using a package like HTML::Mason or Embperl?

If you are calling the mod_perl routines with the html #include syntax, I don't think you can do it very easily.

--
$you = new YOU;
honk() if $you->love(perl)