Emacs works with several window systems, most notably the X Window
System. Both Emacs and X use the term "window", but use it
differently. An Emacs frame is a single window as far as X is
concerned; the individual Emacs windows are not known to X at all.
Variable:window-system
This variable tells Lisp programs what window system Emacs is running
under. The possible values are
x
Emacs is displaying using X.
pc
Emacs is displaying using MS-DOS.
w32
Emacs is displaying using Windows.
mac
Emacs is displaying using a Macintosh.
nil
Emacs is using a character-based terminal.
Variable:window-setup-hook
This variable is a normal hook which Emacs runs after handling the
initialization files. Emacs runs this hook after it has completed
loading your init file, the default initialization file (if
any), and the terminal-specific Lisp code, and running the hook
term-setup-hook.
This hook is used for internal purposes: setting up communication with
the window system, and creating the initial window. Users should not
interfere with it.
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