Controller is a superclass for grouping the miscellaneous control-related Devices that exist. Examples of Controllers are ...

Controller is a superclass for grouping the miscellaneous control-related Devices that exist. Examples of Controllers are SCSIControllers, USBControllers, SerialControllers, ... The Controller class is an abstraction for Devices with a single protocol stack, which exist primarily for communication to, and control or reset of downstream (ControlledBy) Devices.