f="coreasynchost.html#grammarkdown_CoreAsyncHost_class">CoreAsyncHost</a></dd>
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      <p>
        <p>An optional host to use as a fallback for operations not supported by this host.</p>

        
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  <h5 class="returns">Returns</h5>
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  <div class="property">
    <div><a class="xref" href="coreasynchost.html#grammarkdown_CoreAsyncHost_class">CoreAsyncHost</a></div>
    <p>
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  <h4 id="grammarkdow