gistfile1.cl

(def-vu0-fun vu0-fun (input1 :in vf01
                      input2 :in vf02
                      output :out vf03)  
 (add output input1 input2))

(defun my-ee-fun ()  
  ; do something funky, set stuff etc and then call the code  
  (vu0-fun))