Emacs and a couple of key plugins can get you pretty darned close to the Cat interface. But here's the thing, Emacs is still behind the Open Genera interface wh

Emacs and a couple of key plugins can get you pretty darned close to the Cat interface. But here's the thing, Emacs is still behind the Open Genera interface which I believe, predates the Cat. And the extensability of the Lisp Machine/Emacs is superior to that of the Cat.