code: def installedDependents(self, target):
      
      for dc in self.store.query(_DependencyConnector,
                                 _DependencyConnector.target == target):
          depends = dependentsOf(dc.installee.__class__)
          if self.__class__ in depends:
              yield dc.installee
docs: Return an iterable of things installed on the target that
      require this item.