the front end, in the jargon of the power plant controls engineer, consists of the boiler master and turbine master. As explained in Part I of this two-part series, the operator's window into the control sys­tem is referred to as a station or master, and it provides the operator interface for a given control loop. Access to that loop is typically from a switch or hand station located on the control panel in older plants or, more com­monly, the operator's keyboard in plants fortunate enough to be equipped with digital controls.