That's one good question, up to this point I've only had the chance to use the main Application. Although, I doubt that they would do P2P from the browser, since they need to have the songs cached in your computer before being able to become part of the P2P network.
I currently use two LED Displays plugged in to my Macbook Pro 15''. One thing that you need to bear mind when acquiring the LED Displays is that they tend to get dust behind the glass. It's not complicated to clean, but it involves taking off the glass.