I have found forth-like languages very simple to implement, and very useful as a sort of minimal interpretter. Things are further simplified if you you pair down the functions/keywords you define to a bare minimum, rather than trying to do a full "standard forth" implementation. This winds up giving you something more like an HP calculator than "real forth", but it can be just as useful... BillW -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email listserv@mitvma.mit.edu with SET PICList DIGEST in the body