                Determine whether the handle is open.
                </p>
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                <p>
                  <a class="link" href="windows__object_handle/lowest_layer.html" title="windows::object_handle::lowest_layer"><span class="bold"><strong>lowest_layer</strong></span></a>
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                <p>
                  Get a reference to the lowest layer. <br> <span class="silver"> &#8212;</span><br> Get a const
               