[Zope] tree state cookie

Howdy! I just recently got complaints from people visiting my web site. They have activated the "website wants to set cookie" alarm and they got lots of alarms when visiting my website. Since I never use any cookies it wasn't hard to find the cause: I wasn't aware that trees use cookies to store their state. Is there an option to disable this? (Cuz I don't want no cookies;) --Ragnar