I just tried the feature out on my windows pc with chrome, and chrome only reacts to ok google when you have a new, empty tab, or the google search page open an

I just tried the feature out on my windows pc with chrome, and chrome only reacts to ok google when you have a new, empty tab, or the google search page open and active as the main tab. Additionally i checked with procmon what network activity chrome was making, and while it starts sending stuff AFTER "ok google" is activated, it doesn't send any between me saying it and chrome confirming it. The theory that it's a small local plugin is also affirmed by the fact that my cellphone can do "ok google" without any sort of network, and is sometimes tricked into activating by audiobooks that make noises completely unlike "ok google".