Retina MBP as 2nd Display

[JeffreyM]

Des anyone know if I could use a Retina MBP as a 2nd display for my 2009 Mac Pro via target display mode?

I want the retina display for graphics work, but want the power of the Mac Pro when I'm at my desk, so it'd between a retina MBP and an IBM T221

 

[Inconsequential]

I don't think the MBPs support that.. Previous gen 27" iMacs only AFAIK.