Connect two iMacs and an LED Cinema Display to MacBook Pro In my office I have a brand new Thunderbolt-equipped iMac, an older iMac (Mini DisplayPort), and an LED Cinema Display (Mini DisplayPort). I want to connect these three displays to my MacBook Pro with Retina display. Is there any way I can do that?

The office also has other iMacs and Cinema Displays of varying ages and technologies available for use. If there is no possibility of making my current setup work, is there any conceivable configuration that would make three displays possible?
The Retina MacBook Pro (13 and 15) both allow for two external monitors using either both Thunderbolt Ports (and correct adapters) or two external monitors (one using HDMI to correct adapter and the other Thunderbolt to adapter).

In both cases, three displays work - the retina display and two external monitors. To add a third display, you'll need a USB display card (there are many and some are cheaper than $30 with performance to match the price) or a software solution to drive the iMac over VNC or similar networked protocol.

Out of the box, the Retina MacBook Pro are not designed to run three external displays so you'll need something extra to make things work.


http://support.apple.com/kb/HT5219#dispnum


See note 4 in the above article for RMBP details.