Ok, the following command turns-on the master node. They are located around 0,0 like a large green node.
(at_Equip_setComponentMasterEntityVisibility 1)
the following command turns-off the master node.
(at_Equip_setComponentMasterEntityVisibility 0)
It does not appear that I will be using anything to do with Master Nodes but was wondering about their significance as an understanding of the "big picture".