Hybrid
kernels are
used in most commercial operating systems such as Microsoft
Windows NT 3.1, NT 3.5, NT 3.51, NT 4.0, 2000, XP, Vista, 7, 8, 8.1 and 10. Apple Inc's own macOS uses a hybrid
kernel called XNU which is based upon code from OSF/1's Mach
kernel (OSFMK 7.3) and FreeBSD's monolithic
kernel.
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