his message.
 </p>

 <p>
 For messages sent to names, the Pid of the sender is included with the
 message. The sender Pid is also available for link, unlink and exit
 messages. It is not available for sendTag messages sent to Pids.
 </p></div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the Pid of the sender, or null if it was not available.</dd>
</dl>
</li>
</ul>
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<h4>type</h4>
<pre>public&nbsp;int&nbsp;type(