NSUserNotification
A notification that can be scheduled for display in the notification center.
Declaration
class NSUserNotificationOverview
When the system delivers a notification, information about when the notification was actually presented to the user (if at all) and other details are provided in the notification object. User applications can create NSUserNotification objects and register them with the NSUserNotificationCenter object to notify the user when an application requires attention.
Threading Information
The NSUserNotificationCenter class and the NSUserNotification class are both thread safe.