[Zope] AUTHENTICATED_USER change on the fly?

[julio dinis]

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

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