Hi I am using slime from cvs (I think downloaded around July 5th) In my .emacs i put (setq slime-default-lisp 'sbcl) (setq slime-lisp-implementations '( (sbcl ("sbcl" "--userinit" "/home/antony/fooo.lisp") :coding-system utf-8-unix ) (ccl ("/home/antony/bin/ccl")) )) I run M-x slime and it starts sbcl correctly If I change (setq slime-default-lisp 'sbcl) to (setq slime-default-lisp 'ccl) Now ccl runs correctly , but when I do C-u M-x slime sbcl it runs sbcl but does not seem to use the parameters "sbcl" "--userinit" "/home/antony/fooo.lisp The same thing thing happens vice versa for ccl (which I don't understand at all since it has no parameters, I have it hard coded in my shell script home/antony/bin/ccl) Summary of the problem as I see it - I can't have a second slime that uses program arguments I can include more of my .emacs if this is not sufficient. Thanks, -Antony