[Zope] Change AUTHENTICATED_USER without standard login screen

[Klimovich Alexander]

Hi, everybody!
Is anyone can help me?

Problem:
I give access to the first page (login page) of my site to everyone =
(anonymous user).
Than, he is entering username and password (the same as Zope's username =
and password) on this page.
Can I change his roles (from anonymous to which one has in Zope) without =
standard login dialog ?
(If can, how?)

Many thanks,
Alexander Klimovich