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Reference documents describe and define programming interfaces, file formats, scripting language terminology, and schemas.

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Mac OS X ABI Dynamic Loader Reference (HTML) (PDF)
Describes the functions used to access Mach-O files.
Cocoa 2005-11-09
Mac OS X ABI Mach-O File Format Reference (HTML) (PDF)
Describes the data structures that make up the Mach-O file format.
Cocoa 2009-02-04
Message Framework Reference (HTML)
Describes the Objective-C API for sending email messages through the Mail application.
Cocoa 2008-04-08
NSAccessibility Protocol Reference (HTML) (PDF)
Describes the interface for receiving accessibility-related messages.
Cocoa 2007-12-11
NSActionCell Class Reference (HTML) (PDF)
Describes the interface for the active area in a control.
Cocoa 2007-02-28
NSAffineTransform Additions Reference (HTML) (PDF)
Describes additions to support affine transformations.
Cocoa 2007-02-28
NSAffineTransform Class Reference (HTML) (PDF)
Describes an affine transformation from one coordinate space to another.
Cocoa 2007-01-15
NSAlert Class Reference (HTML) (PDF)
Describes a window that displays a message and obtains the user's response to it.
Cocoa 2007-04-25
NSAnimatablePropertyContainer Protocol Reference (HTML) (PDF)
Describes the interface for an animatable proxy for views and windows.
Cocoa 2009-05-06
NSAnimation Class Reference (HTML) (PDF)
Describes the behavior of an animation.
Cocoa 2007-10-31
NSAnimationContext Class Reference (HTML) (PDF)
Describes nested transaction support for animating views.
Cocoa 2008-02-08
NSAppleEventDescriptor Class Reference (HTML) (PDF)
Describes the class used to access the basic data structures in an Apple event.
Cocoa 2007-04-10
NSAppleEventManager Class Reference (HTML) (PDF)
Describes the class used to work with Apple event handler routines and to suspend and resume event handling.
Cocoa 2006-05-23
NSAppleScript Additions Reference (HTML) (PDF)
Describes additions to the NSAppleScript class to provide syntax-highlighted script source.
Cocoa 2006-05-23
NSAppleScript Class Reference (HTML) (PDF)
Describes the class that provides the ability to load, compile, and execute scripts.
Cocoa 2007-07-10
NSApplication Class Reference (HTML) (PDF)
Describes the responder object that manages an application's events and resources.
Cocoa 2009-02-04
NSArchiver Class Reference (HTML) (PDF)
Describes a class that encodes objects into an architecture-independent format.
Cocoa 2006-05-23
NSArray Class Reference (HTML) (PDF)
Describes the class used to manage an immutable ordered collection of objects.
Cocoa 2008-06-09
NSArrayController Class Reference (HTML) (PDF)
Describes a Cocoa bindings-compatible manager of an array or set.
Cocoa 2007-04-09
NSAssertionHandler Class Reference (HTML) (PDF)
Describes the facility for handling false assertions.
Cocoa 2007-02-22
NSAtomicStore Class Reference (HTML) (PDF)
Describes a Core Data atomic persistent store.
Cocoa 2008-10-15
NSAtomicStoreCacheNode Class Reference (HTML) (PDF)
Describes a node in an atomic persistent store.
Cocoa 2006-10-09
NSATSTypesetter Class Reference (HTML) (PDF)
Describes a typesetter that places glyphs for text layout.
Cocoa 2009-03-04
NSAttributeDescription Class Reference (HTML) (PDF)
Describes the class used to define attributes of an entity in a Core Data managed object model.
Cocoa 2007-10-31
NSAttributedString Application Kit Additions Reference (HTML) (PDF)
Describes additions for analyzing and using attributed strings.
Cocoa 2007-12-04
NSAttributedString Class Reference (HTML) (PDF)
Describes a character string with attributes.
Cocoa 2008-10-15
NSAutoreleasePool Class Reference (HTML) (PDF)
Describes the interface to the deferred-release mechanism in Cocoa's reference-counted memory management system.
Cocoa 2009-01-02
NSBezierPath Class Reference (HTML) (PDF)
Describes a vector-based path consisting of line and curve segments.
Cocoa 2007-03-02
NSBitmapImageRep Class Reference (HTML) (PDF)
Describes an object that draws an image from bitmap data.
Cocoa 2009-01-06
NSBox Class Reference (HTML) (PDF)
Describes a view that can display its border and a title.
Cocoa 2008-10-15
NSBrowser Class Reference (HTML) (PDF)
Describes a control for manipulating one- or two-dimensional data sets.
Cocoa 2007-04-05
NSBrowserCell Class Reference (HTML) (PDF)
Describes a cell that displays data in a browser.
Cocoa 2007-04-01
NSBundle Additions Reference (HTML) (PDF)
Describes additions for loading nib files in Cocoa applications.
Cocoa 2007-07-19
NSBundle Class Reference (HTML) (PDF)
Describes a collection of resources used in a program.
Cocoa 2007-07-19
NSButton Class Reference (HTML) (PDF)
Describes a control that responds to clicks.
Cocoa 2007-04-01
NSButtonCell Class Reference (HTML) (PDF)
Describes a cell that responds to mouse clicks.
Cocoa 2009-04-08
NSCachedImageRep Class Reference (HTML) (PDF)
Describes cached image data that is ready to be rendered.
Cocoa 2007-01-15
NSCachedURLResponse Class Reference (HTML) (PDF)
Describes a cached response to a URL load request.
Cocoa 2008-05-02
NSCalendar Class Reference (HTML) (PDF)
Describes a calendar.
Cocoa 2009-02-04
NSCalendarDate Class Reference (HTML) (PDF)
Describes a Gregorian date.
Cocoa 2008-05-04
NSCell Class Reference (HTML) (PDF)
Describes the interface for cell objects.
Cocoa 2009-02-04
NSChangeSpelling Protocol Reference (HTML) (PDF)
Describes the interface for correcting a misspelled word.
Cocoa 2006-05-23
NSCharacterSet Class Reference (HTML) (PDF)
Describes a set of Unicode characters used in scanning and searching operations.
Cocoa 2008-10-15
NSCIImageRep Class Reference (HTML) (PDF)
Describes an object that draws an image from a Core Image CIImage instance.
Cocoa 2007-01-15
NSClassDescription Class Reference (HTML) (PDF)
Describes the interface for information about the relationships and properties of a class.
Cocoa 2006-05-23
NSClipView Class Objective-C Reference (HTML) (PDF)
Describes the class that contains and scrolls the document view of a scroll view.
Cocoa 2006-05-23
NSCloneCommand Class Reference (HTML) (PDF)
Describes the class used to clone a scriptable object or objects.
Cocoa 2006-05-23
NSCloseCommand Class Reference (HTML) (PDF)
Describes the class used to close a scriptable object or objects--typically a document or window.
Cocoa 2006-06-28
NSCoder Application Kit Additions Reference (HTML) (PDF)
Describes additions for converting archived NXColor objects into NSColor objects.
Cocoa 2006-05-23
NSCoder Class Reference (HTML) (PDF)
Describes the abstract class that provides the basis for archiving.
Cocoa 2006-07-23
NSCoding Protocol Reference (HTML) (PDF)
Describes the interface for archiving.
Cocoa 2006-05-23
NSCollectionView Class Reference (HTML) (PDF)
Describes a collection of views that displays content in a grid.
Cocoa 2007-12-11
NSCollectionViewItem Class Reference (HTML) (PDF)
Describes a controller that mediates between a prototype view and a model object.
Cocoa 2006-12-28
NSColor Class Reference (HTML) (PDF)
Describes a representation of color and opacity.
Cocoa 2009-01-06
NSColorList Class Reference (HTML) (PDF)
Describes an ordered list of colors identified by keys.
Cocoa 2007-02-28
NSColorPanel Class Reference (HTML) (PDF)
Describes the standard panel used for color selection.
Cocoa 2007-02-28
NSColorPicker Class Reference (HTML) (PDF)
Describes the interface for custom views in a color panel used for color selection.
Cocoa 2007-02-28
NSColorPickingCustom Protocol Reference (HTML) (PDF)
Describes the interface for receiving custom color-picker user-interface requests.
Cocoa 2007-04-01
NSColorPickingDefault Protocol Reference (HTML) (PDF)
Describes the interface for receiving basic color-picker user-interface requests.
Cocoa 2007-04-27
NSColorSpace Class Reference (HTML) (PDF)
Describes a representation of a system or custom color space.
Cocoa 2007-02-28
NSColorWell Class Reference (HTML) (PDF)
Describes a control for displaying and selecting colors.
Cocoa 2007-02-28
NSComboBox Class Reference (HTML) (PDF)
Describes a control for entering text or selecting from a pop-up list of items.
Cocoa 2006-05-23
NSComboBoxCell Class Reference (HTML) (PDF)
Describes the text field that provides the user interface for NSComboBox objects.
Cocoa 2006-05-23
NSComboBoxCellDataSource Protocol Reference (HTML) (PDF)
Describes the interface for receiving data requests from an NSComboBoxCell object.
Cocoa 2006-05-23
NSComboBoxDataSource Protocol Reference (HTML) (PDF)
Describes the interface for receiving data requests from an NSComboBox object.
Cocoa 2006-05-23
NSComparisonMethods Protocol Reference (HTML) (PDF)
Describes the interface for default comparison methods in the NSSpecifierTest class.
Cocoa 2006-05-23
NSComparisonPredicate Class Reference (HTML) (PDF)
Describes the class used to define a predicate used to compare the results of two expressions.
Cocoa 2007-04-30
NSCompoundPredicate Class Reference (HTML) (PDF)
Describes a representation of logical gate and comparison operations.
Cocoa 2006-07-04
NSCondition Class Reference (HTML) (PDF)
Describes a pthread-style condition variable and associated mutex lock.
Cocoa 2008-09-09
NSConditionLock Class Reference (HTML) (PDF)
Describes an integer-based condition for use in thread locking.
Cocoa 2007-01-15
NSConnection Class Reference (HTML) (PDF)
Describes an object that manages communication between objects in different threads.
Cocoa 2008-02-08
NSControl Class Reference (HTML) (PDF)
Describes the interface for views that respond to user actions by sending action messages.
Cocoa 2008-10-15
NSController Class Reference (HTML) (PDF)
Describes the interface for controllers used with Cocoa bindings.
Cocoa 2007-04-02
NSCopying Protocol Reference (HTML) (PDF)
Describes the interface for providing immutable duplicates of objects.
Cocoa 2006-05-23
NSCountCommand Class Reference (HTML) (PDF)
Describes the class used to count the number of objects of a specified class in the specified object container.
Cocoa 2006-05-23
NSCountedSet Class Reference (HTML) (PDF)
Describes an unordered collection of possibly identical elements.
Cocoa 2009-05-06
NSCreateCommand Class Reference (HTML) (PDF)
Describes the class used to create a specified scriptable object.
Cocoa 2006-05-23
NSCursor Class Reference (HTML) (PDF)
Describes the appearance of the user interface cursor.
Cocoa 2009-01-06
NSCustomImageRep Class Reference (HTML) (PDF)
Describes an object that supports drawing an image using a custom data format.
Cocoa 2007-01-19
NSData Class Reference (HTML) (PDF)
Describes an immutable byte buffer.
Cocoa 2009-05-06
NSDate Class Reference (HTML) (PDF)
Describes a single point in time.
Cocoa 2008-10-15
NSDateComponents Class Reference (HTML) (PDF)
Describes the components of a date.
Cocoa 2008-10-15
NSDateFormatter Class Reference (HTML) (PDF)
Describes a date formatter.
Cocoa 2008-11-19
NSDatePicker Class Reference (HTML) (PDF)
Describes a control for displaying and editing a date.
Cocoa 2008-06-09
NSDatePickerCell Class Reference (HTML) (PDF)
Describes a cell for displaying and editing a date.
Cocoa 2008-06-09
NSDecimalNumber Class Reference (HTML) (PDF)
Describes a decimal number.
Cocoa 2007-10-31
NSDecimalNumberBehaviors Protocol Reference (HTML) (PDF)
Describes the interface for controlling the behavior of NSDecimalNumber objects.
Cocoa 2006-05-23
NSDecimalNumberHandler Class Reference (HTML) (PDF)
Describes an object that specifies decimal number rounding and error handling.
Cocoa 2007-04-30
NSDeleteCommand Class Reference (HTML) (PDF)
Describes the class used to delete a specified scriptable object or objects.
Cocoa 2006-05-23
NSDeserializer Class Reference (HTML) (PDF)
Describes a deprecated technology replaced by the NSPropertyListSerialization class.
Cocoa 2006-05-23
NSDictionary Class Reference (HTML) (PDF)
Describes an immutable collection of key-value pairs.
Cocoa 2009-04-08
NSDictionaryController Class Reference (HTML) (PDF)
Describes a Cocoa bindings-compatible manager of a dictionary.
Cocoa 2008-06-05
NSDictionaryControllerKeyValuePair Protocol Reference (HTML) (PDF)
Describes the interface for managing key-value pairs used by a dictionary controller.
Cocoa 2008-06-05
NSDirectoryEnumerator Class Reference (HTML) (PDF)
Describes the facility for enumerating the contents of a directory.
Cocoa 2008-10-15
NSDistantObject Class Reference (HTML) (PDF)
Describes the proxy for an object in another application or thread.
Cocoa 2007-01-19
NSDistantObjectRequest Class Reference (HTML) (PDF)
Describes an object that handles communication requests from other processes.
Cocoa 2007-01-22
NSDistributedLock Class Reference (HTML) (PDF)
Describes a mutex lock that spans multiple processes.
Cocoa 2007-01-22
NSDistributedNotificationCenter Class Reference (HTML) (PDF)
Describes an object that synchronously broadcasts notifications to other tasks.
Cocoa 2007-04-01
NSDockTile Class Reference (HTML) (PDF)
Describes the interface for customizing an application's dock tiles
Cocoa 2009-03-04
NSDocument Class Reference (HTML) (PDF)
Describes the interface for managing content using Cocoa's document system.
Cocoa 2009-01-06