Screen is a full-screen window manager that multiplexes a physical
terminal between several processes (typically interactive shells).
Each virtual terminal provides the functions of a DEC VT100 terminal
and, in addition, several control functions from the ANSI X3.64 (ISO
6429) and ISO 2022 standards (e.g. insert/delete line and support for
multiple character sets). There is a scrollback history buffer for each
virtual terminal and a copy-and-paste mechanism that allows moving text
regions between windows.

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