title: Google cloud messaging's setRegisteredOnServer() function.
body: <p>In GCM, why everytime after the device sends parameter to the server, it will then call <code>setRegisteredOnServer(Context context, boolean flag)</code> , in the documentation it says this function <strong>Sets whether the device was successfully registered in the server side.</strong> I don't get the point of this function, could anyone explain it?</p>