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Lites was a Unix-like operating system, based on 4.4BSD and the Mach microkernel.
Specifically, Lites was a multi-threaded server and emulation library that provided unix functionality to a Mach-based system. At the time of its release Lites provided binary compatibility with 4.4BSD, NetBSD, FreeBSD, 386BSD, UX (4.3BSD) and Linux.