xui2d.jar

Hi, There are xui2d.jar and x2.b4xlib files in library folder of B4J (or B4A) x2.b4xlib is X2 framework and it uses xui2d.jar I think ? (although can not see any reference in X2 source files) I see a method called setTangentSpeed for b2contact class in a jbox2d page.. It is used for conveyor...