Did you by any chance make a note of the sites where you read this?
I'm sorry, I did not. Give me a bit and I'll go find some info.
I'm especially interested in this bit of your post: "Once you are casting video to a device you can then browse any of your open tabs in a web browser without interruption to whatever video(s) you are casting."
Okay...... I'm back!!!

My understanding of how the Chromecast dongle works for streaming services is as follows.....
You plug the Chromecast dongle into a TVs HDMI port. The TV needs to know that the "input" will be the C-cast dongle. On the TV select the port the dongle is connected to as the desired video output. You then pair the Chromecast dongle with the home WiFi network.
Then from a laptop, desktop, Android or iOS device connect to the Chromecast dongle via the home WiFi network.
From there a user selects whatever built-in streaming app they desire (YouTube, Prime, Hulu etc. etc.). Stream shows. Done.
Chromecast has and supports 1000s of streaming apps. Some come pre-installed on the dongle.
Once that is up and streaming video to the TV, open whatever web browser on a laptop, desktop, Android or iOS device and surf the net as desired.
All that ^^^^^^^^^ is my simplified explanation. But when you visualize the connections, it makes total sense (well, to me it does [[[ GEEK ]]] ).
Streaming video via Chromecast and browsing the internet are two completely separate connections as far as internet protocol within a home network is concerned. Like a laptop, desktop, Android or iOS device the Chromecast dongle has its own unique connection, IP addr, via WiFi.
We have a 1 GIG fiber internet connection and have not had any kind of connection problems with multiple concurrent video streams while also surfing the net.
The link you previously shared is correct. Although it does not explain how it is done.
It's also my understanding that you can use the Chromecast dongle on a laptop, desktop, Android or iOS device only. To watch a video stream and surf the net via a browser, on one device, one would split the screen via the Chromecast sw to do both.
I hope that makes sense.
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