|CGCMConfig||Config used to set different options in Google Cloud Messaging|
|CGCMPubSub||GcmPubSub provides a publish-subscribe model for sending GCM topic messages|
|C<GCMReceiverDelegate>||Delegate for receiving status of upstream messages sent via Google Cloud Messaging|
|CGCMService||GoogleCloudMessaging (GCM) enables apps to communicate with their app servers using simple messages|
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