I think your asking if you can hook up your imac to another screen ,and you want the extra screen to display what is going on on the imac? IF this is what your asking i would say yes because i do it in my little studio and at home when i mix. I have a imac at home and have a HP screen hooked up to it so i have a screen for my digital mixer. And in the little studio i also have a imac hooked up to a screen in the booth.. all i did was by a white adaptor (mini dvi to agv cable) at best buy. i asked the apple rep how to hook up another monitor and he gave little white adaptor that cost 30$. for the screen in the booth i had to by an extension for the extra screen (agv)and the white adaptor for my imac, that was about 90$ total.. and then for the screen in the booth i bought a wireless mouse for my imac (bluetooth) and i use that to move the mouse on the screen while im in the booth (thought the imac)... Hope this helps..