I'm an instructor. I teach all day long, using the secondary display on my MacBook Pro as the display screen. The problem is, I don't have eyes in the back of my head, so I can't see the secondary display behind me. Now while I'm presenting slides, I usually don't have a problem, I can use "presenter view" to see the slides. But the moment I want to show an application, or display a web site on the secondary screen I have to turn my head around (which is unforgivable in a class, especially if you speak at the same time) to see the screen. I need an application that "mirrors" in a window, the contents of the secondary display/screen/monitor. In my pre-macintosh days, I could use Ultra-mon, but they don't have a Macintosh version. I asked. Is there a Mac application that will allow me to do this? I'd love to buy it if it is out there.