The AppROT events are designed to let interested applications or components know when an ESRI application has started or terminated. When an instance of an application starts or terminates, an event will automatically be fired from the AppROT to let all listeners know about it. This may be useful if listening components or applications need to maintain "switch-to" lists, or if they want to synchronize representations between all running instances so that if something happens in one application, all anothers can be informed and update themselves appropriately. Such "coordinating" components would need to know when new instances start and when existing ones terminate.