try:
                  prop = user.getPropertysheet('mutable_properties');
                  print 'hum'
                  print 'TYPE: '+type(prop)
                  print prop.__doc__
                  print 'KEYS: '+prop.keys()
                  #prop['login_time']=self.ZopeTime()
            except KeyError:
                print 'The key mutable_properties doesn\'t exist'