+..:: What you need ::..
+
+- a platform file describing the environment. You can go to
+ the Platform Description Archive (http://pda.gforge.inria.fr/) to
+ get an existing one or generate your own platform with the
+ SIMULACRUM tool (see 'Download' section there).
+
+- a hostfile. Like in almost all MPI distributions, the hostfile
+ list the hosts which the processes will be mapped on. At present,
+ the format is one hostname per line. The hostnames must be present
+ in the platform file.
+
+ Note: the mapping of MPI processes (ranks) follows the order of the
+ hostfile. Rank 0 is mapped to first hostname in hostfile, Rank 1
+ on second hostname, etc. If n (where -np n) is greater than the
+ number l of lines in hostfile, the mapping is done round-robin.
+
+
+..:: Try the examples ::..
+