A controller of gaming machines includes an input/output module adapted to receive signals that represent a current status of a parameter of the gaming machines. A microprocessing unit generates for each gaming machine(s) an icon having variable visual indicia indicative of a value of the parameter being monitored. The microprocessing unit automatically changes in substantially real-time the visual indicia associated with the icon to reflect a change in the status of the parameter of an associated first gaming machine in accordance with a first received signal.