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/usr/share/openmpi/help-mpi-api.txt is in openmpi-common 1.4.3-2.1ubuntu3.

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# -*- text -*-
#
# Copyright (c) 2006      High Performance Computing Center Stuttgart, 
#                         University of Stuttgart.  All rights reserved.
# Copyright (c) 2006-2008 Cisco Systems, Inc.  All rights reserved.
# $COPYRIGHT$
# 
# Additional copyrights may follow
# 
# $HEADER$
#
# This is the US/English general help file for Open MPI.
#
[mpi-function-after-finalize]
Calling any MPI-function after calling MPI_Finalize is erroneous.
The only exceptions are MPI_Initialized, MPI_Finalized and MPI_Get_version.
#
[mpi-initialize-twice]
Calling MPI_Init or MPI_Init_thread twice is erroneous.
#
[mpi-abort]
MPI_ABORT was invoked on rank %d in communicator %s 
with errorcode %d.

NOTE: invoking MPI_ABORT causes Open MPI to kill all MPI processes.
You may or may not see output from other processes, depending on
exactly when Open MPI kills them.