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Continue to ChatNotification Center in OS X Yosemite: A Dashboard replacement https://macdailynews.com/2014/06/11/notification-center-in-os-x-yosemite-a-dashboard-replacement/
Notification Center in OS X Yosemite: A Dashboard replacement https://macdailynews.com/2014/06/11/notification-center-in-os-x-yosemite-a-dashboard-replacement/