id="qv-wrapper">
<div id="qv">

<h2>Quickview</h2>

<ul>
<li>Get an introduction to key CCS terms and concepts.</li>
<li>Learn how to send and receive both upstream and downstream messages in CCS.</li>
</ul>


<h2>In this document</h2>

<ol class="toc">
  <li><a href="#gcm">CCS vs. GCM HTTP</a> </li>
  <li><a href="#usage">How to Use CCS</a>
    <ol>
      <li><a href="#send_msg">Sending Messages</a></li>
      <li><a href="#format">Message Format</a></li>
      <li><a href="#msg_examples">Message Examples<