ode>userID</code> to limit recipients to a single   
   specified user, you can use <code>role</code> to send a message to everyone with 
   a minimum role level or above as follows: 
   <ul>
   <li><strong>UserRoles.VIEWER</strong>: Messages are sent to everyone.</li>
   <li><strong>UserRoles.PUBLISHER</strong>: Messages are sent to publishers and owners.</li>
   <li><strong>UserRoles.OWNER</strong>: Messages are sent only to owners.</li>
   </ul>
   </p></div>
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