t asynchronous execution,
 your handler will be executed on the main thread.
 <p>
 Use this anytime your handler does not need to access state that is not considered thread safe.
 <p>
 Use context.isAsync() to determine if you are async or not.</div>
<dl class="notes">
<dt>Parameters:</dt>
<dd><code>id</code> - </dd>
<dd><code>handler</code> - </dd>
<dt>Returns:</dt>
</dl>
</section>
</li>
<li>
<section class="detail" id="registerStaticCompletion(java.lang.String,java.lang.String)">
<h3>registerStaticComple