The next obscure command we’ll talk (briefly) about is dribble.  This is nothing more than an output capturing function that allows you to keep a record of your interaction with the Lisp environment.  You should usually not be using this.  You should be using SLIME under Emacs to do your Lisp development, and you can keep a much more helpful record using those tools.  I will note that dribble does not play well with SLIME, at least in my setup, which uses SBCL v1.1.14, Emacs 24.1.1, and SLIME from late January, 2013.