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Important messages could be signaled by striking the bell on the teletype. This was carried over on PCs by generating a buzz sound.
:⁴ Line feed is used for "end of line" in text files on Unix / Linux systems.
:⁵ Carriage Return (accompanied by line feed, and thus usually written as 'CRLF') is used as "end of line" character by Windows, MS-DOS, and most minicomputers other than Unix- / Linux-based systems. Classic Mac OS and other vintage OS used CR only.
:⁶ Control-O

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