The root actor's name is always zero<code>"root"</code>. <i>appType</i> is a string indicating what sort of program the server represents. There may be more properties present, depending on <i>appType</i>.
<i>traits</i> is an object describing protocol variants this server supports that are not convenient for the client to detect otherwise. The property names present indicate what traits the server has; the properties' values depend on their names. This version of the protocol defines no traits, so <i>traits</i> must be an object with no properties, <tt>{}</tt>.