The 13" MacBook Pro can only drive two displays total with its integrated Intel HD3000 graphics, so if you plug in two displays, the built-in screen will go black. You can easily daisy chain two Thunderbolt Displays to a single Thunderbolt port on these machines. The iMac, Mac mini, and MacBook Pro, on the other hand, use the Light Ridge controller with two DisplayPort channels. As we noted, the latest MacBook Airs use a smaller Eagle Ridge controller that only has one DisplayPort channel, so these machines are limited to just one Thunderbolt or miniDP display, period. It also makes it possible to use multiple external displays with an Apple notebook for the first time-at least without resorting to workarounds like USB video adapters. So if you plug a Thunderbolt Display into a Mac mini, for instance, you can plug a 12TB RAID into the back of the display and still have speedy access to its data. That's not necessarily a bad thing, as a single port can daisy chain six devices. The inclusion of the Thunderbolt port on Apple's Thunderbolt display is an important one, since all Thunderbolt-equipped Macs, save the 27" iMac, have just a single Thunderbolt port.
Most Mac models support at least two external monitors with a few caveats-the most important being that you cannot daisy chain a Mini DisplayPort monitor to the Thunderbolt Display's Thunderbolt port. Apple has now begun shipping the 27" Thunderbolt Display that the company unveiled in July, and you can plug the 2560x1440 pixel display-which includes a complement of USB, FireWire, Ethernet, and Thunderbolt ports of its own-into any MacBook Pro, MacBook Air, Mac mini, or iMac released this year.
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