So Dragonfly BSD is the WinNT* of UNIX world, interesting!

  "One big part of the goal set will be the creation of a 
  middle 'emulation' layer which is managed by the kernel
  but runs in userland, which will take over all primary 
  system call entry points (in userland) and convert them 
  to syscall messages that the kernel understands. 4.x, 
  5.x, SysV, Linux, and other compatibility sets will be 
  moved out of the kernel and into this middle layer."

-- Matthew Dillon (main dev): http://lists.freebsd.org/pipermail/freebsd-current/2003-July...

* think about subsystems like Win32, POSIX, OS/2 of the WinNT series operating system (XP, Vista, 7, 8, Xbox, ReactOS)