session objects crossing applications

I need help. I've got two copies of my application. foobar and foobar_dev When I go to http://foo.com/foobar/ a session is created and a database connection class is established and placed into this session. Then if within the same browser (using internet explorer) I go to http://foo.com/foobar_dev/ it will see not create a new database connection b/c it finds the one from http://foo.com/foobar. foobar and foobar_dev are suppose to point to different databases, but other than that all is identical. If I open a new internet explorer window via the windows Start menu all is fine. I thought if the url base is different then the session would be different? This is how it is with JSP. Am I miss-understanding something? Thanks for any assistance with this.