The Application Kit, usually called AppKit, is a graphical user interface toolkit from NeXTSTEP. Along with Foundation and Display PostScript, it is one of the core parts of the OpenStep specification of APIs. AppKit and Foundation were inherited into Cocoa, the Objective-C API framework of macOS. GNUstep, GNU's implementation of the OpenStep/Cocoa API, also contains an AppKit.Read more on Wikipedia
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