GNU Emacs Manual - Pop Up Window

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## Displaying in Another Window

`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 C-o bufname `RET``
  Display buffer bufname in another window, but don't select that buffer or that window. This runs `display-buffer`.
`C-x 4 f filename `RET``
  Visit file filename and select its buffer in another window. This runs `find-file-other-window`. See section Visiting Files.
`C-x 4 d directory `RET``
  Select a Dired buffer for directory directory in another window. This runs `dired-other-window`. See section Dired, the Directory Editor.
`C-x 4 m`
  Start composing a mail message in another window. This runs `mail-other-window`; its same-window analogue is `C-x m` (see section Sending Mail).
`C-x 4 .`
  Find a tag in the current tags table, in another window. This runs `find-tag-other-window`, the multiple-window variant of `M-.` (see section Tags Tables).
`C-x 4 r filename `RET``
  Visit file filename read-only, and select its buffer in another window. This runs `find-file-read-only-other-window`. See section Visiting Files.

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