Create a new autoreleased notification by calling +notificationWithName:object:userInfo: with a nil user info argument.

Create a new autoreleased notification.

Returns the notification name.

Returns the notification object.

Returns the notification user information.

Returns the default notification center being used for this task (process). This is used for all notifications posted by the Base library unless otherwise noted.

Registers observer to receive notifications with the name notificationName and/or containing object (one or both of these two must be non-nil; nil acts like a wildcard). When a notification of name name containing object is posted, observer receives a selector message with this notification as the argument. The notification center waits for the observer to finish processing the message, then informs the next registree matching the notification, and after all of this is done, control returns to the poster of the notification. Therefore the processing in the selector implementation should be short.

The notification center does not retain observer or object. Therefore, you should always send removeObserver: or removeObserver:name:object: to the notification center before releasing these objects.
As a convenience, when built with garbage collection, you do not need to remove any garbage collected observer as the system will do it implicitly.

NB. For MacOS-X compatibility, adding an observer multiple times will register it to receive multiple copies of any matching notification, however removing an observer will remove all of the multiple registrations.

Posts notification to all the observers that match its NAME and OBJECT.
The GNUstep implementation calls -postNotificationName:object:userInfo: to perform the actual posting.

Creates and posts a notification using the -postNotificationName:object:userInfo: passing a nil user info argument.

The preferred method for posting a notification.
For performance reasons, we don't wrap an exception handler round every message sent to an observer. This means that, if one observer raises an exception, later observers in the lists will not get the notification.

Deregisters observer from all notifications. This should be called before the observer is deallocated.

Deregisters observer for notifications matching name and/or object. If either or both is nil, they act like wildcards. The observer may still remain registered for other notifications; use -removeObserver: to remove it from all. If observer is nil, the effect is to remove all registrees for the specified notifications, unless both observer and name are nil, in which case nothing is done.