A. MCS can send push messages directly to the application on the device by using a web socket connection that is kept open until the device unregisters from MCS.

B. The application instance on the mobile device can send push notifications through MCS that are then dispatched to all mobile clients registered for the application in MCS.

C. MCS can schedule notifications to be sent to the application instance on the device and messages are routed via push delivery networks such as APNs, GCM, or WINS.

D. Push messages can be received only if a valid token is provided with the MCS device registration that was previously obtained from APNs, GCM, or WINS.