The controller is the component of the SD-UX software management command that is invoked by the user on the local host.

a computing component that executes software to close servo loops, read external sensors, and interface with higher level software

an abstract entity that embodies the control behavior associated with a particular component

an example of a module, as are Interfaces to other vehicles, a human user, the vision system, or the PIC electronics

a richer component then a pure window, but full featured components need a XModel interface too

In Tivoli Workload Scheduler for z/OS, the component that runs on the controlling system, and that contains the tasks that manage the plans and databases.

A proprietary component to the alkaline etching system used to control copper concentration based on baume or specific gravity. The controller activates a pump that automatically adds replenisher at the prescribed copper concentration and removes spent etchant.