 items. See
“Details of the Specialized Method” for more information.</p>
    </div>
    <div class="section level2">
    <h2 id="details-of-the-specialized-method">Details of the Specialized Method<a class="anchor" aria-label="anchor" href="#details-of-the-specialized-method"></a></h2>


<ul><li><p>If <code>i</code> is <code>"?"</code>, then the return value is a list
containing four items, each of which is a character vector
holding the names of things that can be accessed with <code>[[</code>.
The <c