Hi Folks, Here's the list of mpi opaque objects and a few additional constructs for consideration of states in the presence of process failures: communicators - Aourelian, Wesley groups - Rich G. data types - Sayantan RMA windows - Howard files (file handles) - Darius B. info object - Darius error handler - Darius message obj. - David S. request - Manjo status - Manjo op - Darius port (mpi-2 dynamic) - David S. user buffers attached to MPI for bsends - Sayantan Need to define lifecycle of the object in the case of no process failures, and in the case when one or more process failures occur while the object exists.