[CalendarServer-users] Receiving push notifications

Hi, I'm working on a calendar server client, and I was wondering how I can subscribe/register for push notifications? I can communicate with the server and have retrieved this information: <push-transports xmlns='http://calendarserver.org/ns/'> <transport type='APSD'> <token-url> <href xmlns='DAV:'>/mm/token</href> </token-url> <subscription-url> <href xmlns='DAV:'>/mm/sub</href> </subscription-url> <apsbundleid xmlns='http://cal.me.com/_namespace/'>com.me.cal</apsbundleid> <courierserver>webcourier.push.apple.com</courierserver> <env xmlns='urn:mobileme:davservices'>PRODUCTION</env> </transport> but I haven't been able to find any documentation on how to actually register/receive change notifications. Cheers, Demitri