Object visInfoObject = Canvas3D.visInfoTable.get(gc); return (visInfoObject != null) && (visInfoObject instanceof Long);
Object fbConfigObject = Canvas3D.fbConfigTable.get(gc); return ((fbConfigObject != null) && (fbConfigObject instanceof Long));
    static boolean isValidConfig(GraphicsConfiguration gc) {	// Check to see if a valid visInfo pointer has been cached.	Object visInfoObject = Canvas3D.visInfoTable.get(gc);	return (visInfoObject != null) && (visInfoObject instanceof Long);    }