[Zope] Setting the password of an unauthenticated user

Hello. I am trying to assign a new password to a Zope user who has not authenticated(this would be the case if a user forgot his/her password and the administrator would have to email them a new one). Is there any way to do this? There is a function in User.py called _getpassword but it is not implemented. Also, there are other functions in this module that would do the good as well but they aren't implemented also. Any help would be greatly appreciated. Thanks. -Asad