I defer to prior discussions.
As to Hangouts, https://www.google.com/#q=hangouts+on+android+TV finds that if it's in the Android Play Store, you're good to go. If not, then not.
I got a new Sony Bravia KDL-W800C Android TV in India, do i need to install any antivirus application on it. If any which one.
Also can i use Hangout on it, how?

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