 exclude_archived: do not return archived private channels (default: 0)
 </p>

<h3 class="function"><a name="mark-3">mark/3</a></h3>
<div class="spec">
<p><tt>mark(Token::string(), Channel::string(), Timestamp::string()) -&gt; <a href="#type-http_response">http_response()</a></tt><br></p>
</div><p>Sets the read cursor in a private group.</p>

<h3 class="function"><a name="open-2">open/2</a></h3>
<div class="spec">
<p><tt>open(Token::string(), Channel::string()) -&gt; <a href="#type-http_response">http_respo