vides an extensible mechanism that lets you, the R user, decide what
method to use. Call the <code>plan()</code> function with one of the
following values (without quotes—these are function names, not
strings):</p>
<ul>
<li><code>multisession</code>: Launches up to <em>n</em> background R
processes on the same machine (where <em>n</em> is the number of
processor cores on the system, minus 1). These background processes will
be used/recycled for the life of the originating R process. If a future
is launche