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In page Microkernel:

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Microkernels were a very hot topic in the 1980s when the first usable local area networks were being introduced.[citation needed]. The AmigaOS Exec kernel was an early example, introduced in 1986 and used in a PC with relative commercial success. The lack of memory protection, considered in other respects a flaw, allowed this kernel to have very high message-passing performance because it did not need to copy data while exchanging messages between user-space programs.[7]