Cast icon on web app?

Is this a chromecast(googlecast?) button on the web app?  When I click it on multiple machines, nothing happens except that it gets highlighted a bit.

@TD2779 I assume you are using Google Chrome browser? If so, you need to have the Chromecast Plugin installed.

What it does for me is to only pull down the cast plugin menu in Chrome as an example:

Hmm, I DO have that extension installed, but its one of the icons hidden on the toolbar

That must be why I wasn’t seeing anything happening.  Thanks!