Hm, speculating a bit, but it feels like NTSYNC is essentially a beginning of NT Subsystem for Linux, or maybe ntoskrnl as a kernel module. Feels like the most clean and fast way to port Windows, since the rest of the interfaces are in the user space in real Windows. Essentially should be almost without overhead: user: [gdi32.dll,user32.dll,kernel32.dll -> ntdll.dll] -> kernel: [ntoskrnl.ko]