[Zope] Look for browser id name in forms only

Hi, it seems to me that setting this checkbutton in the Settings tab of the browserIdManager doesn't automatically put any hidden field into the pages produced by Zope. Worse of all, the REQUEST object still has something like _ZopeId=somealphanumericcodehere in its 'HTTP_COOKIE' field. So the questions are: 1. do I have to manually code the form hidden fields containing the _ZopeId value? 2. why do I still get _ZopeId in the cookies, when I set the 'Look for browser id name in' checkbox to 'forms only'? Thanks, Carlo.