Can someone tell what cb and cb2 are supposed to be (semantically) in

public extern static void WorldRayCast(int newtonWorld, ref Vector3 p0, ref Vector3 p1, WorldRayCastCB cb, object userData, WorldRayCastCB cb2);

Also, in Haddd.Physics.RayCast setting .OnlyMass0 to false is irrelevant in the current version correct?

Is there any facility in the engine that allows fullscreen/windowed toggling and game resolution + viewport resize "in-game"?