-float Drag(entity this, float force_allow_pick, float ischeat);
-void Drag_Begin(entity dragger, entity draggee, vector touchpoint);
-void Drag_Finish(entity dragger);
-float Drag_IsDraggable(entity draggee);
-float Drag_MayChangeAngles(entity draggee);
-void Drag_MoveForward(entity dragger);
-void Drag_SetSpeed(entity dragger, float s);
-void Drag_MoveBackward(entity dragger);
-void Drag_Update(entity dragger);
-float Drag_CanDrag(entity dragger);
-float Drag_IsDragging(entity dragger);
-void Drag_MoveDrag(entity from, entity to);