I don't know mcuh about LISP. But what I know about OSes means I know the advantage of Everything is a File.<p>On Plan9 if you can open / read / write / close / remove you can do almost anything : networking, graphics, serial, debugging, mouse control, the list extends by design.<p>We have a few Schemes ported for those who had a personal itch. ALISP claimes a port but their site is down for me.