<span class="identifier">MPI_Init</span></code> and <code class="computeroutput"><span class="identifier">MPI_Finalize</span></code>
        calls. Second, we're passing Python objects from one process to another through
        MPI. Any Python object that can be pickled can be transmitted; the next section
        will describe in more detail how the Boost.MPI Python layer transmits objects.
        Finally, when we receive objects with <code class="computeroutput"><span class="identifier">recv</span></cod