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16.4 Displaying in Another Window
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`C-x 4' is a prefix key for commands that select another window
(splitting the window if there is only one) and select a buffer in that
window.  Different `C-x 4' commands have different ways of finding the
buffer to select.

`C-x 4 b BUFNAME <RET>'
     Select buffer BUFNAME in another window.  This runs
     `switch-to-buffer-other-window'.

`C-x 4 f FILENAME <RET>'
     Visit file FILENAME and select its buffer in another window.  This
     runs `find-file-other-window'.  Note: Visiting.

`C-x 4 d DIRECTORY <RET>'
     Select a Dired buffer for directory DIRECTORY in another window.
     This runs `dired-other-window'.  Note: Dired.

`C-x 4 m'
     Start composing a mail message in another window.  This runs
     `mail-other-window', and its same-window version is `C-x m' (Note:
     Sending Mail).

`C-x 4 .'
     Find a tag in the current tag table in another window.  This runs
     `find-tag-other-window', the multiple-window variant of `M-.'
     (Note: Tags).

   If the variable `display-buffer-function' is non-`nil', its value is
the function to call to handle `display-buffer'. It receives two
arguments, the buffer and a flag that if non-`nil' means that the
currently selected window is not acceptable. Commands such as
`switch-to-buffer-other-window' and `find-file-other-window' work using
this function.