#202203021657’s user interface is similar to 4.3 BSD.
Mach User Interface
-
Mach
Mach is a microkernel-based operating system. All of its UNIX-specific code are moved to the user-mode servers, only leaves few necessary abstractions or features inside the kernel. This resulted that many operating systems could run on top of Mach like 202204071131# without much hassle.