In reviewing the proposal, a couple questions/comments came up:

(1) Are the semantics for the MPI probe operations (probe, iprobe, mprobe) well defined?  Including when MPI_ANY_SOURCE is used?

(2) For comm_shrink, what happens when the remote group in an intercommunicator becomes empty?  Is it valid to get back an intercommunicator with an empty remote group?

(3) In 15.2 (pg. 594:21), can we replace the sentence "always complete in a finite amount of time" with the simpler "eventually complete"?

 ~Jim.