You can download it from here: CE White Paper
From the Abstract:
Device Stage, introduced in Windows 7, helps users discover and use devices that are connected to their personal computers. MTP Responder for Windows Embedded CE 6.0 R3 adds functionality to Windows Embedded CE 6.0 R3 that helps OEMs create devices that are compatible with Device Stage.
Have fun reading!
So long and thanks for all the fish!