find-alternate-file-other-window
find-alternate-file-other-window is an interactive compiled Lisp function in `files.el
'.
(find-alternate-file-other-window FILENAME &optional WILDCARDS)
Find file FILENAME as a replacement for the file in the next window.
This command does not select that window.
See C-x C-f for the possible forms of the FILENAME argument.
Interactively, or if WILDCARDS is non-nil in a call from Lisp,
expand wildcards (if any) and replace the file with multiple files.