An interfaCe between PrologappliCation programs and the X Window System that aims to be independent from the Prologengine, provided that it has a Quintus {foreign funCtion} interfaCe (e.g. {SICStus} and {YAP}). It is mostly written in Prolog and is divided in two libraries: Edipo - the lower level interfaCe to the Xlib funCtions and Ytoolkit - the higher level user interfaCe toolkit. . E-mail: Ze' Paulo Leal CC.up.pt>. (1993-03-02)