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Mpiexec is a replacement program for the script mpirun, which is
part of the MPICH package. It is used to initialize a parallel job
from within a PBS batch or interactive environment. Mpiexec uses
the task manager library of PBS to spawn copies of the executable
on the nodes in a PBS allocation.

WWW:	http://www.osc.edu/~pw/mpiexec/index.php