From: Richard Warren <richardw@mprich.hpc.pko.dec.com>
Newsgroups: comp.parallel.mpi
Subject: Re: Dynamic process ranks and MPI ???
Date: Mon, 16 Nov 1998 09:21:48 -0500
Organization: Digital Equipment Corporation, Palo Alto, CA, USA
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    <72ahq8$7ag$1@walter-fddi.cray.com> <364C9858.B817DE5E@LL.MIT.EDU>
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>  If there is a way to
> start MPI programs in seperate shells that allows them to communicate please
> let me know.
>
> --
> Cordially,
> Michael Starkie

Actually, the MPI-2 specification allows just the sort of behaviour you're
looking for.
For more information you should check the web pages at http://www.mpi-forum.org
and look specifically for the chapters on process creation an management, e.g.
MPI_Open_port, MPI_Comm_accept, MPI_Comm_connect, etc.

The latest MIT press publication on MPI also covers MPI-2 interfaces...
I hope this helps!

Richard A. Warren