[Zope] AUTHENTICATED_USER change on the fly?

Hi all, dont ask me why I need this but: I need to be able to before execute a method change from anonymous and be superuser(because only with this user I can execute the method, but would like to do it with anonymous), and after the execution of the method return to Anonymous. I know I could configure some proxy roles but have run all possibilities in the situation I'm testing. What I need is help to know if there are specific methods from Accesscontrol or something like that to do what I want. Can anyone help me here? Thank you very much, Júlio Silva ______________________________________________________ Get Your Private, Free Email at http://www.hotmail.com