d results.  In the
following example for the protocol, the letter <em>S</em> stands for
<em>receive-pack</em> and the letter <em>H</em> stands for this hook.</p>
</div>
<div class="literalblock">
<div class="content">
<pre># Version and features negotiation.
S: PKT-LINE(version=1\0push-options atomic...)
S: flush-pkt
H: PKT-LINE(version=1\0push-options...)
H: flush-pkt</pre>
</div>
</div>
<div class="literalblock">
<div class="content">
<pre># Send commands from server to the hook.
S: PKT-LINE(&lt;old-oid&g