ends "ACK d continue" to let the client know to stop
walking down that line (so don&#8217;t send c-b-a), but it&#8217;s not done yet,
it needs a base for x. The client keeps going with S-R-Q, until a
gets reached, at which point the server has a clear base and it all
ends.</p>
</div>
<div class="paragraph">
<p>Without multi_ack the client would have sent that c-b-a chain anyway,
interleaved with S-R-Q.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_multi_ack_detailed">multi_ack_detailed</h2>
<div cla