Example image of eyePlorer eyePlorer map for 'Mach (kernel)': Carnegie Mellon University Microkernel Operating system Berkeley Software Distribution University of Utah Unix Mac OS X NeXTSTEP OpenStep XNU Computer Systems Research Group FreeBSD Inter-process communication Accent kernel Microsoft Microsoft Research Richard Rashid Apple Inc. Avadis Tevanian NeXT Plan 9 from Bell Labs Platform virtualization Abstraction (computer science) Pipeline (Unix) Shared memory Massively parallel User space Exokernel Hardware abstraction layer Signal (computing) System call Interrupt Library (computing) Memory management unit Copy-on-write Monolithic kernel VAX Motorola 68030 RT Sun Microsystems Sequent Computer Systems 1 Open Software Foundation IBM IBM Workplace OS Mac OS Reentrant (subroutine) Intel i486 Multiprocessing ChorusOS