Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The Application Kit is a collection of classes within the OpenStep specification and provided by such operating systems as OPENSTEP, GNUstep, and Mac OS X under Cocoa, providing classes oriented around graphical user interface capabilities. An equivalent in Cocoa Touch is UIKit. OpenStep was an object-oriented application programming interface (API) specification for an object-oriented operating system that uses any modern operating system as its core, principally developed by NeXT with Sun Microsystems. OPENSTEP (all capitalized) was a specific implementation of the OpenStep API developed by NeXT.

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