 
 (defun yacas-help ()
   (interactive)
-  (let ((fn (read-string "Help on: ")))
+  (let ((fn (completing-read "Help on: " yacas-words)))
     (select-window (split-window))
     (if (string= fn "")
         (browse-url

    (yacas-single-command (substring stuff 0 end))
    (setq stuff (substring stuff end))))

;;; Sending information to the process should be done through these
;; next four commands


  "*The indentation in yacas-mode"
  :group 'yacas
  :type 'integer)

(defcustom yacas-use-emacs-help t
  "*If non-nil, use browse-url to get help"
  :group 'yacas
  :type 'boolean)

;(defcustom yacas-prompt-regexp "^\\(In> \\|Out> \\)"
;  "A regular expression for the Yacas prompt."
