> This is basic fortran programming issue, you may want to consult
> some fortran programming book.
It is more an issue with understanding the usual implementations
of the MPI Fortran bindings, namely, having to include mpif.h in
ALL procedures that wish to make use of the MPI variables.
The OP would be better advised to consult some MPI documentation.
Most MPI documentation would:
a) mention the recommendation of the use of mpif.h
b) tell one that MPI_Comm_World and bretheren in mpif.h are
You won't find that info by consulting some fortran programming
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