Hi, I added a printf statement at the beginning of MPI_Init() in mpich2-1.4 in order to check the arguments of MPI_Init(). When running a Fortran program, e.g. ep.S.1, the arguments of MPI_Init() are NULL; however, when running a C program, e.g. is.S.1, *argc of MPI_Init() is 1 and (*argv)[0] points to the name of the executed file is.S.1. Can anyone tell us why there is difference in dealing with arguments of MPI_Init() between C and Fortran programs? How could arguments be transferred to MPI_Init() for Fortran programs in mpich2? Thanks. Best, Clara