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(elisp)Window Systems

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Window Systems
==============

   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.