Hi, I'm looking for 2 additional reviews for Ticket #59. If there is additional interest to clarify the status of MPI::FILE_NULL and MPI::WIN_NULL and if you are interested to have the predefined C++ datatypes const-qualified again, please review ticket 59 (https://svn.mpi-forum.org/trac/mpi-forum-web/ticket/59). Many thanks in advance Hubert *