What is your operating system? Extended desktop will allow you to drag a window over to the other monitor click here It can get a bit confusing as you use the same mouse pointer on each display scrolling between the 2.
I've managed to get it to work now using a program called UltraMon. I'm on Windows 7 and it uses the extended desktop. One problem I've found though is that if I make the video I'm watching on the 2nd monitor full screen, and I click anything on the laptop screen it exits full screen. I've sort of got round it by zooming in on it. I would say my issue is resolved anyway.
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