Hi Robert,
This is more of a question for browser manufacturers, as for this group ;) If you can put your browser over multiple screens, the answer is yes. However, I would do it a tad different. I would open multiple tabs that work in unison. You can do this by using, for example, local storage, and use that to communicate between tabs. However, this is limiting your apps to a single system. If you are thinking big, use WebRTC peer2peer to keep your tabs synchronised. this way your app can span multiple systems. Is that scalable enough for you?
Regards
Sander