Thanks Paolo- my directions could have been more clear. I meant "leave the project references to pch.h and pch.cpp", but didn't directly state to overwrite the actual files with the generated ones. I've simplified the instructions now. Yes, you do want the pch.h and pch.cpp that are generated by the AllJoyn code generator.
To answer some questions- this was a technology demo. The goal was to get a 6x1 Eyefinity 12K-wide setup running at 60 Hz (this was a first).
Regarding the question about windowed mode, no, with Eyefinity this was a single display surface (to Windows) at 11,520 x 2,160. Hard to really describe the experience, you have to see it in real life!