Forth and PostScript are quite similar but I wouldn't <say that LISP was a stack based language. It uses stacks <but most languages use stacks. In Forth, you have direct <control of two stacks as necessary for the language. First to me stack languages are the post-fixed non register variable oriented ones that are very unlike Pascal, C or Basic. < Forth has the advantage that action is read <left to right or "Do-it As You See It". LISP <has the ability to concatenate several of similar <operations like (+ ). I know Forth by way of postscript as they are very similar if you pull the graphic operators out of postscript. Lisp, I doubt I've seen it. <LISP has the advantage over <Forth in that all parameters are specific in the This is lost one me as lisp is largely unknown. Allison