public final static Enumeration<CMLibrary> libraries(final int code) {
        final Vector<CMLibrary> V=new Vector<CMLibrary>();
        for(int l=0;l<libs.length;l++)
            if((libs[l]!=null)
            &&(libs[l].libraries[code]!=null)
            &&(!V.contains(libs[l].libraries[code])))
                V.addElement(libs[l].libraries[code]);
        return V.elements();
    }