Last year, at Google I/O 2013, some major new features and improvements were announced for Google Cloud Messaging (GCM) -the replacement for Cloud to Device Messaging (C2DM). A couple of the new bits were even featured during the keynote, particularly notification syncing, which the audience loved. The one thing most people don't know is that most of the coolest things announced that year were marked as beta and locked behind an application process. Plenty of developers were accepted, but it certainly wasn't available to everybody.

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