This was a new term to me. A "second screen" is when you have a device with its own display, and which also controls another screen. I imagine it's for cases li

This was a new term to me. A "second screen" is when you have a device with its own display, and which also controls another screen. I imagine it's for cases like if your phone were also to display content on a 40" screen in your living room, or you wanted a web-based presentation system where the operator/presenter gets a different screen than the presentation proper. (When I saw the title, I thought it was about the GNU "screen" terminal multiplexer. The term "secondary screen" made me think of the TSA. I write this now should others be equally as confused as I was.)