Quick one - apologies if this has been asked before but I'm struggling to find it through searches. I'm looking into a multi-monitor setup for my MBA 13". It is powered by a HD 4000 graphics chip. Theoretically, what is the maximum extended resolution this could support in clamshell mode? Ideally, I'd be looking to power 3 monitors at around 1920x1080 using a Triple Head DisplayPort adapter of some sort, but there doesn't appear to be a great deal of information that comes across as being reliable considering the initial outlay required! Any pointers from those in the know, or those who have done similar would be greatly appreciated - cheers!