Universal > Entity, Action. Entity > Image, HTMLDocument, JavaClasses, CGTool. CGTool = PrologPlusCG. [CGTool : PrologPlusCG]- -iconOf->[Image = "ImgPrlg.gif"], -manualOf->[HTMLDocument = "PrologCGManual.htm"], -codeOf->[JavaClasses = "DocTest.txt"]. MMCGExample :- [JavaClasses = y]<-codeOf-[CGTool: PrologPlusCG]-iconOf->[Image = x], show(wnd1, x), show(wnd2, y), read(a), close(wnd1), close(wnd2), write("The two windows have been closed."), /.