How do you start push Notifications?
If this question is about sending a push notification to the client mobiles from the server, then Server side program has to be configured to use GCM (Google Cloud Messaging). Once the server is configured to use GCM and client android app also configured with GCM client framework, then GCM will automatically push the notifications from server to the client mobile by using GCM framework.
More about using GCM framework to send push notifications from server to client (android phones), follow this official android link.
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