https://stackshare.io/stackups/google-cloud-messaging-vs-notifiers
Google Cloud Messaging - Google Cloud Messaging (GCM) is a free service that enables developers to send messages between servers and client apps. This includes...
google cloud messagingvsdifferencesstackshare
https://developers.google.com/web/shows/google-io/2014/deep-dive-google-cloud-messaging-for-chrome
A deep dive into cross-platform messaging, with a focus on Chrome's API and implementations. [ed: similar talk from android]
google cloud messagingdeep diveweb devchrome