I forgot to mention something about the new Synapse technology: you can now have a synapse on an arbitrary sub-form within a rule. Silly example: :circumference (c? (* 2 (f-sensitivity :l+w (:delta 10) (+ (^length) (^width)))) Not sure if it matters, but I get a big kick out of that for some reason. kt -- Cells? Cello?: http://www.common-lisp.net/project/cells/ Cells-Gtk?: http://www.common-lisp.net/project/cells-gtk/ Why Lisp? http://lisp.tech.coop/RtL%20Highlight%20Film "Doctor, I wrestled with reality for forty years, and I am happy to state that I finally won out over it." -- Elwood P. Dowd