Maybe I'm missing something, but why can't I use my TV - which is a device in my Home Group - as a monitor? I.e, instead of casting to it, be able to select it as a second monitor that I could select to extend or duplicate. When the TV was sitting beside my PC I did use a HDMI cable to connect it and used it as a monitor. But now that it is in a different room, I need to do this via WiFi. (And I'm asking this question because I can't get iTunes to cast a movie from my PC to my TV.) Thanks for any help on this.