'Override this in a GUI environment!'

def prompt_user_passwd(self, host, realm):

    import getpass
    try:
        user = raw_input(('Enter    username    for    %s    at    %s:    ' % (realm, host)))
        passwd = getpass.getpass(('Enter    password    for    %s    in    %s    at    %s:    ' % (user, realm, host)))
        return (user, passwd)
    except KeyboardInterrupt:
        print
        return (None, None)
    return
