A pseudo-terminal is a special interprocess communication channel
that acts like a terminal. One end of the channel is called the
master side or master pseudo-terminal device, the other side
is called the slave side. Data written to the master side is
received by the slave side as if it was the result of a user typing at
an ordinary terminal, and data written to the slave side is sent to the
master side as if it was written on an ordinary terminal.
Pseudo terminals are the way programs like xterm and emacs
implement their terminal emulation functionality.
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