@EmilyMockett, you have a powerful machine! Apples are great.
I tried a "two screen" app on my Acer laptop when I was doing photoshop work, it was difficult because my screen space is ultimately limited. I am a big advocate of dual screens and desktops :).
@EmilyMockett, is QuickBooks Desktop for Mac popular in the UK? I am curious if @yosh01's Parallels program would make transferring data between the Mac and Windows version any easier.
