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Re:It's all fun and games until someone [XOFF] by userbinator on Sunday June 21, 2015 @08:21AM (#9753125)
There is a good historical background article on the whole TTY subsystem here:

http://www.linusakesson.net/programming/tty/

It mentions what XON/XOFF, as well as what all the other control characters do.

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