Document Revision History

This table describes the changes to NSNotificationCenter Class Reference.

Date	Notes
2008-07-11	Removed a statement that the observer parameter can be nil in the removeObserver:name:object: method.
2007-04-02	Updated for Mac OS X v10.5
2006-11-07	Clarified how a notification center manages observers in its dispatch table.
	Updated return type of `defaultCenter`.
2006-05-23	First publication of this content as a separate document.

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