span>
        </dt>
        <dd>
          The number of individual execution units of the machine.
          <div class="features">read-only</div>
</dd>
        <dt id="operatingSystem" class="property">
          <span class="name"><a href="dart-io/Platform/operatingSystem.html">operatingSystem</a></span>
          <span class="signature">&#8594; <a href="dart-core/String-class.html">String</a></span>
        </dt>
        <dd>
          A string representing the operating system or platform.
          <d