on, see the <code class="literal">Error Returns</code>
        section of the <em class="citetitle">Getting Started with Berkeley DB</em> guide. 
     </p>
        </div>
        <div class="sect2" lang="en" xml:lang="en">
          <div class="titlepage">
            <div>
              <div>
                <h3 class="title"><a id="sharedmemory"></a>Shared Memory Regions</h3>
              </div>
            </div>
          </div>
          <p>
            The subsystems that you enable for an environmen