>>2 Database On the lowest level, a PicoLisp database is just a collection of external symbols. They reside in a database file, and are dynamically swapped in and out of memory. Only one database can be open at a time (pool). Pilog (PicoLisp Prolog) A declarative language is built on top of PicoLisp, that has the semantics of Prolog, but uses the syntax of Lisp. HOT