** scheme sessions
   :PROPERTIES:
   :DATE:     2010-08-31
   :END:
#+begin_src scheme :var number=9 :session *scheme* :scheme guile
  (+ number 0)
#+end_src

#+name:
: 9

#+begin_src scheme :var number=9 :session *scheme* :scheme racket
  (+ number 1)
#+end_src

#+name:
: 10