The Slave_Control is used as the transform controller for the boxes in a RingArray system object. You cannot create a RingArray system using MAXScript in 3ds Max, but properties for this controller are accessible by MAXScript for existing RingArray systems. A RingArray system actually consists of two types of controllers - the master controller and Slave_Control controllers. The Slave_Control controllers are used as the transform controller for all the boxes in the RingArray system, and the master controller controls the individual Slave_Control controllers. Changing a property value for one Slave_Control in a RingArray system changes the property value for all Slave_Controls in the system.