Emacs Lisp Tutorials How-to Expand shell environment variables in file paths Open a URL in a browser Discussions Argument-List(&optional, &rest) Reference (browse-url URL &rest ARGS) (substitute-in-file-name) ?<character> (interactive) let set, setq, setq-default default-directory Index An Introduction to Programming in Emacs Lisp an-introduction-to-programming-in-emacs-lisp/ Functions funcs/ Language Specifications lang/ Variables vars/