How Can I Have Multiple Android Devices Message Each Other through a Google Account

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http://stackoverflow.com – I want to develop an app that communicates to other instances of the same app on other Android devices tied to a Google account. It has nothing to do with webcams, but this app (Internet Surveillance IP Cam) does (I think) exactly what I want to do: https://play.google.com/store/apps/details?id=com.ivuu On first launch, after some app specific configuration, the users chooses a Google account and is asked to authorize access to Google Talk (View and Send chat messages). The app can then see other devices' cameras that associated with that account and have the app installed. I assume all th (HowTos)