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In page Mach (kernel):

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Around this time a new generation of central processors (CPUs) were coming to market, offering a 32-bit address space and (initially optional) support for a memory management unit (MMU). The MMU handled the instructions needed to implement a virtual memory system by keeping track of which pages of memory were in use by various programs. This offered a new solution to the port concept, using the copy-on-write (COW) mechanism provided by the virtual memory system. Instead of copying data between programs, all that was required was to instruct the MMU to provide access to that same memory. This system would implement the interprocess communications (IPC) system with dramatically higher performance.[citation needed]