How can I use my rMBP as a secondary display for my iMac using thunderbolt?

Based on this thread, it's not possible: https://discussions.apple.com/message/19207767
But, I'm stubborn and refuse to believe that. Maybe they've released a software update (e.g., in Mountain Lion) that has since made this possible? Maybe there is an app that allows for this?
Note that I don't want a solution that involves network hacks... this is at work, and I'd rather not slow down the network for others. And I'm not interested in the reverse setup (i.e., using my iMac as a secondary display for my rMBP).
iMac: 27-inch, Late 2012. NVIDIA GeForce GTX 660M 512 MB. OS X 10.8.4.
rMBP: Retina, Mid 2012 (15" I think). NVIDIA GeForce GT 650M 1024 MB. OS X 10.8.4.

It's not possible. You can use the iMac as a display for the MBP, but the reverse is not possible. The MBP does not have Target Display Mode as a feature and no third-party app nor hack can enable something that doesn't exist. The only way to accomplish this will be one of the network solutions.
Regards.

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How can I use my rMBP as a secondary display for my iMac using thunderbolt?

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