Alerts, alarms, reminders, email—chances are you see a steady stream every day. Notification Center has become OS X’s Grand Central Station for the information competing for your attention. Its settings control which apps can post messages to the upper-right corner of your display, as well as how those messages look. And the Notification Center sidebar, which slides in from the right of your screen, gives you an overview of it all.
El Capitan continues to refine the big improvements to Notification Center that Yosemite added ①.