You cant because how are you going to get a whole operating system thats on your imac to run as an external monitor? hehe. If you really want to though you can hook up your laptop to a CINEMA HD (30 inch) but i think you need a titanium laptop....:S
Shop for your Apple, Mac, iPhone and other computer products on Amazon.
We are a participant in the Amazon Services LLC Associates Program, an affiliate program designed to provide a means for us to earn fees by linking to Amazon and affiliated sites.