It's only in the new manual I'm currently working on (it will be released an ~1 week) with several other new HowTos.

But it's realy simple:
-create a server for each zone (attetion: use different ports and you can only create one server per application, so use more windows if you want to use more servers)
-on server A you load New York and on server B you load Boston
-connect with a client to server A or B
-if you want to change the server: disconnect and connect again to the other server