AN iNterface betweeNPrologapplicatioN 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 iNProlog 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 Ncc.up.pt>. (1993-03-02)