Comment by cwstarblazer

Absolutely, the VxD layer has also been of particular interest to me. Unfortunately, much of that VxD layer is poorly-documented. Much of what comprises the Win32 subsystem in Windows 95 (i.e. VWIN32) is not well documented, nor is the equivalent VxD in Win32s. VFLATD, originally a part of Video for Windows, was to my knowledge not documented until Windows 95.