[Zope] authentication via form

[BORGULYA Gergely]

Hi,

I'm developing a small site in Zope with a simple, own management
interface (where the contets of Documents can be easily changed using
forms).

The last few days' change in the ZopeBook on www.zope.org seems to be very
useful, thanks for the authors!
Although I could not find out, how to authenticate users not by calling a
zope object that needs special permissions to access, but using a form
with a login/passwd box and passing the arguments to some kind of
functions.

Can REQUEST.['AUTHENTICATED_USER'] be modified somehow? I could not find
any function that I suppose to do this.

Gergely Borgulya