session cookie paths

Dear All, I've been trying to figure out a solution for this problem and have googled the subject but cannot come up with anything meaningful. I have several applications running on my server which use php and sessions. In each case, logging out from an application destroys the session. The trouble is that all the applications (four of them) share the same id: PHPSESSID and path: / My first hunch is to try to use .htaccess in each application's root directory to override these php.ini variables. Am I on the right track? Regards, Ian