As I remember it, he did<p>telnet bk-server 5000<p>and typed &quot;help&quot;.<p><a href="https:&#x2F;&#x2F;lwn.net&#x2F;Articles&#x2F;132938&#x2F;" rel="nofollow">https:&#x2F;&#x2F;lwn.net&#x2F;Articles&#x2F;132938&#x2F;</a>