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C-x 4 is a prefix key for a variety of commands that switch to a buffer in a different window—either another existing window, or a new window created by splitting the selected window. See Window Choice, for how Emacs picks or creates the window to use.
switch-to-buffer-other-window). See Select Buffer.
display-buffer). See Displaying Buffers, for details about how the window is chosen.
find-file-other-window). See Visiting.
dired-other-window). See Dired.
find-file-read-only-other-window). See Visiting.