In a system for outputting a notification including a processor and a computer-readable medium, the computer-readable medium includes instructions that, when executed by the processor, cause the processor to control the system to perform operating a plurality of software sets, each software set configured to individually cause the system to output a separate notification in response to an occurrence of an event commonly associated with the plurality of software sets; detecting that, in response to the occurrence of the commonly associated event, the plurality of software sets is set to cause the system to output a plurality of notifications, respectively, each notification being indicative of the occurrence of the event; and in response to detecting that that the plurality of software sets is set to cause the system to output the plurality of notifications, respectively, causing the system to output fewer than all of the plurality of notifications.