Lisandro Dalcin wrote:

And what about VecView() of serial objects on two different processes? What about parallel Vec's on subcommunicators of COMM_WORLD?

Of course there is nothing special about COMM_WORLD, and there is no way to get consistent naming of serial objects. This would only ensure that all processes in a communicator have the same name for parallel objects and that no process on that communicator uses the name for a different object. There is no guarantee that this name is never used for an object on a different communicator. Jed