(1) A device that coordinates and controls the operation of one or more input/output devices (such as workstations) and synchronizes the operation of such devices with the operation of the system as a whole.
(2) Software that administrators use to perform remote control, file transfer, or chat functions.
(3) The functional component responsible for resource management (load balancing and admission control). The controller communicates with one or more data pumps to initiate and terminate connections to clients.