What is GCM used for?

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Tags

1. #developed
2. #servers
3. #target
4. #google
5. #operating
6. #applications
7. #enables
8. #application
9. #notification
10. #third
11. #android
12. #developers
13. #cloud
14. #information
15. #extensions
16. #system
17. #service
18. #developer
19. #messaging
20. #party
21. #mobile