Source : Free On-Line Dictionary of Computing

NEXTSTEP
     
         The original {multitasking} {operating
        system} that {NeXT, Inc.} developed to run on its proprietary
        {NeXT} computers (informally known as "black boxes").
        NEXTSTEP includes a specific {graphical user interface}, an
        interface builder, {object-oriented} application builder, and
        several "kits" of prebuilt software {objects} such as the
        Indexing Kit for {databases}.  This software runs on top of
        NeXT's version of the {Mach} operating system on {NeXT},
        {486}, {Pentium}, {HP-PA}, and {Sun} {SPARC} computers.
     
        The official spelling changed from "NeXTstep" to "NeXTStep" to
        "NeXTSTEP", and finally "NEXTSTEP".
     
        The last release of NEXTSTEP was 3.3, which NeXT then
        developed into "{OpenStep}".
     
        {TjL's Pages (http://www.peak.org/~luomat/)}.
        {Peanuts (http://www.peanuts.org/peanuts/NEXTSTEP/)}.
     
        See also: {GNUStep}.
     
        (2003-05-23)