MacBook Pro with Retina supports at least 4 screens

Yesterday someone asked me about multi-monitor support for our work machines. I rattled off the standard statistics for Dells, MacBook Airs, MacBook Pros… then realized I wasn’t sure what the Retina Pro supported. This could not stand, so I had to go test it out! The Retina has 2 Thunderbolt ports plus 1 HDMI port. You can, in fact, plug one monitor into each ALONG with your internal screen… for...