Targeted Display Mode using Henge Docks Vertical Dock I have a 2012 MacBook Pro with Retina Display and a Late 2012 21" iMac. I just purchased a Henge Docks Vertical Dock, to use at home, and the plan is to pop my MacBook Pro in and then use the iMac in Targeted Display Mode.

My question is, will this work? Thinking about it, I usually have to wake the MacBook Pro up for it to work in Targeted Display Mode, but as the lid is kept shut by the Vertical Dock, I am not sure it will work.

Has anyone had any experience with this set up?

If not, that's fine, I was planning to go and pick up a 27" monitor anyway (future plan is to run an external GPU for gaming).
Based on the specs you provided above....


  I have a 2012 MBPr and a late 2012 21" iMac....


This should work.  From Apple's website Use your iMac as a display with Target Display Mode



Basically you need a Thunderbolt cable to connect from your TB port on your MBPr to your TB port on your iMac.

Once connected and booted, you just press CommandF2 to toggle Targeted Display Mode on/off.