"According to the first line of the screen man page, "Screen is
a full-screen window manager that multiplexes a physical terminal
between several processes (typically interactive shells)." That's a
mouthful. It's also a little misleading.
"When I think of a window manager, I think of an application
that manages GUI windows on a desktop. When the screen
documentation refers to a "window," it means a virtual terminal
that is running some application. By "window manager," it means
that screen manages one or more virtual terminals. By
"full-screen," it means that screen can expand to the limits of the
real terminal that contains the screen session. And by
"multiplexes," it means that screen can control a number of virtual
terminals and switch the view to any one of them and not interrupt
the running of any of the others.
"While that is the gist of what screen does, that's not the
whole picture. When you execute the screen utility, you are really
spawning a management process and connected to it. This management
process is also known as a screen "session." You can disconnect
from the process at any time and leave everything running just as
if it were running in a terminal. You can also create a number of
different virtual terminals, each running its own application, and
switch among them. When you create these virtual terminals, you can
almost think of them as part of a tabbed terminal emulator such as
Terminal.app on Mac, gnome-terminal on Gnome, or konsole on KDE,
except without the visible tabs."
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