* doc/emacs/sending.texi (Sending Mail):
* doc/emacs/dired.texi (Dired Enter, Dired Visiting):
* doc/emacs/maintaining.texi (Old Revisions)
(Change Log Commands, Looking Up Identifiers):
* doc/emacs/windows.texi (Displaying Buffers):
* doc/emacs/files.texi (Visiting): Add cross-references to where
user options are described which control how windows are split.
* lisp/mail/sendmail.el (mail-other-window):
* lisp/gnus/message.el (message-mail-other-window)
(message-news-other-window):
* lisp/replace.el (occur-mode-goto-occurrence-other-window):
* lisp/vc/vc.el (vc-revision-other-window):
* lisp/vc/vc-dir.el (vc-dir-find-file-other-window):
* lisp/progmodes/xref.el (xref-find-definitions-other-window):
* lisp/simple.el (compose-mail-other-window)
(clone-indirect-buffer-other-window):
* lisp/vc/add-log.el (add-change-log-entry-other-window):
* lisp/view.el (view-file-other-window)
(view-buffer-other-window):
* lisp/window.el (switch-to-buffer-other-window):
* lisp/files.el (find-file-other-window)
(find-file-read-only-other-window)
(find-alternate-file-other-window):
* lisp/dired.el (dired-other-window)
(dired-mouse-find-file-other-window)
(dired-find-file-other-window, dired-jump-other-window): Mention
in the doc strings how to control the way the current window is
split.