ransparent</code>, execute
synchronously and are therefore not relevant for our purposes. There are
also <code>cluster</code> and <code>remote</code> methods, as well as a
separate <code>future.batchtools</code> package, for doing distributed
execution; those may work with promises, but have not been tested by our
team and are not described further in this document.</p>
</div>
<div id="caveats-and-limitations" class="section level2">
<h2>Caveats and limitations</h2>
<p>The abstractions that <code>future</co