[Zope] Checking zope userfolder root

Can this be done from a script? Lets say you have the following directory structure: ROOT/A/B/C/D/E user TEMP is in the acl_user folder in the 'C' directory and hence can log in only at ROOT/A/B/C directory and upwards. lets say he logs in a ROOT/A/B/C/D/E/F I would like to know at which level he was authorized. I am not keen about changing manage user permissions. In otherwords I would like a script that loops back through parents checking to see if folders can be viewed. How can one predict whether a user authorization dialogue will appear. How can one interupt a authorization dialogue from appearing. Thanks Chris