I’d just like to interject for a moment. What you’re refering to as UNIX, is in fact, Emacs/UNIX, or as I’ve recently taken to calling it, Emacs plus UNIX. UNIX is not an operating environment unto itself, but rather another free component of a fully functioning Emacs system made useful by the Emacs lisp interpreter, shell utilities and vital system components comprising a editor, mail reader, and other necessary user interface components.