I am a teacher with a large classroom. The room us very narrow, but long. Consequently, I inevitably have students in the back that can't see. To get around this problem, I am trying to have both a front-of-room and back-of-room display. My main computer connects to a projector. I currently splice those so that I drag what I want to display over to the projector screen. I have a 2nd computer in the back of the room, connected to a Promethean board. I would like to set it up so that whatever is showing up on my projector screen, also shows on that 2nd computer, and therefore the Promethean. Any ideas of how I could accomplish this? We use Windows 7/10 if that factors in. Thank you!!!