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I meant that MPI_Accumulate should be specified here, either in the yes or no column.

I think "can be used only" says all. We also don't say that it can't be used in reductions etc..

We do. The text says "MPI_NO_OP can be used only in MPI_GET_ACCUMULATE and MPI_ACCUMULATE_GET, not in collective reduction operations, such as MPI_REDUCE and others." It begs the question what about MPI_Accumulate? Rajeev