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[master 99c07df] The opening packet's 'traits' property may be omitted.
The root actor's name is always <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. If <i>traits</i> would have no properties, the <code>"traits"</code> property of the packet may be omitted altogether. This version of the protocol defines no traits, so if the <icode>"traits"</icode> property is present at all, its value must be an object with no properties, <tt>{}</tt>.
For web browsers, the introductory packet should have the following form:
