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NeXTSTEP is a discontinued object-oriented, multitasking operating system based on UNIX. It was developed by NeXT Computer in the late 1980s and early 1990s and was initially used for its range of proprietary workstation computers such as the NeXTcube and later ported to several other computer architectures. Although relatively unsuccessful at the time, it attracted interest from computer scientists and researchers. It was used as the original platform for the development of the first AppStore, The Electronic AppWrapper,〔(Electronic AppWrapper ). Kevra.org. Retrieved on 2013-11-22.〕 the first commercial electronic software distribution catalog to collectively manage encryption and provide digital rights for apps and digital media. It was also the platform that created the first web browser by Tim Berners-Lee. After the purchase of NeXT by Apple, it became the source of the popular operating systems OS X, iOS, and now watchOS and tvOS. Many bundled OS X apps, such as TextEdit, Mail and Chess, are descendants of NeXTSTEP applications. ==Overview== NeXTSTEP (also stylized as NeXTstep, NeXTStep, and NEXTSTEP) is a combination of several parts: * a Unix operating system based on the Mach kernel, plus source code from BSD * Display PostScript and a proprietary windowing engine * the Objective-C language and runtime * an object-oriented (OO) application layer, including several "kits" * development tools for the OO layers NeXTSTEP is notable for having been a preeminent implementation of the latter three items. The toolkits offer considerable power, and are the canonical development system for all of the software on the machine. NeXTSTEP's user interface is considered to be refined and consistent. It introduced the idea of the Dock (carried through OpenStep and into today's OS X) and the Shelf. NeXTSTEP also originated or innovated a large number of other GUI concepts which became common in other operating systems: 3D "chiseled" widgets, large full-color icons, system-wide drag and drop of a wide range of objects beyond file icons, system-wide piped services, real-time scrolling and window dragging, properties dialog boxes called "inspectors", and window modification notices (such as the saved status of a file). The system is among the first general-purpose user interfaces to handle publishing color standards, transparency, sophisticated sound and music processing (through a Motorola 56000 DSP), advanced graphics primitives, internationalization, and modern typography, in a consistent manner across all applications. Additional kits were added to the product line to make the system more attractive. These include Portable Distributed Objects (PDO), which allow easy remote invocation, and Enterprise Objects Framework, a powerful object-relational database system. The kits made the system particularly interesting to custom application programmers, and NeXTSTEP had a long history in the financial programming community. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「NeXTSTEP」の詳細全文を読む スポンサード リンク
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