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Emacs Lisp is a dialect of the Lisp programming language used as a scripting language by Emacs (a text editor family most commonly associated with GNU Emacs and XEmacs). It is used for implementing most of the editing functionality built into Emacs, the remainder being written in C (as is the Lisp interpreter itself). Emacs Lisp is also referred to as Elisp, although there is also an older, unrelated Lisp dialect with that name. Read more on Wikipedia...
(message "Hello World")
(defun switch-to-next-window-in-split () (set-window-buffer (next-window) (other-buffer))) (advice-add 'split-window-vertically :before #'switch-to-next-window-in-split)