not quite sure what you meant here but like madog said the 24" ACD was built for the new notebooks. it even has an adaptor that charges them so you leave the other one at work for example.
Been running my new uni 15 inch since day one like this with the laptop open and both at full resolution. My one issue was the DVI adapter from Apple the 30 kept blinking. Finally exchanged that at the Apple store and been running perfect ever since than. The only issue has been this 99 dollar adapter so if you get one and have issues get a a exchange. Seriously i hada lot of blinking coming out of sleep mode and when scrolling. Make sure you get a good DVI adapter