'Attempt an anonymous login.
@param mind: An object to use as the mind parameter to the portal login
call (possibly None).
@rtype: L{Deferred}
@return: A Deferred which will be called back with an avatar when login
succeeds or which will be errbacked if login fails somehow.'

def remote_loginAnonymous(self, mind):

    d = self.portal.login(Anonymous(), mind, IPerspective)
    d.addCallback(self._cbLogin)
    return d
