Windows NT is part of the Microsoft Windows line of operating systems. Microsoft Windows is used to describe Microsoft's flagship OS in general while Windows NT is an outdated OS that used to run on workstations and servers. Windows 2000, XP, Vista, and 7 are all based upon Windows NT.
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Absolutely nothing.
There are very few similarities between Windows 98 and Windows NT, other than a similar interface.
Windows 1.0, 2.0, 3.0, 3.1, NT 3.1, NT 3.5, NT 3.51, and Windows NT 4.Windows 1.0, 2.0, 3.0, 3.1, NT 3.1, NT 3.5, NT 3.51, and Windows NT 4.
98 is a hybrid 16/32bit utilizing OS, as where NT is full 32bit. - Alex C
Windows NT (new technology) added the HAL or Hardware Abstraction Layer to prevent direct interaction between hardware and software.
Windows NT 3.1 only came in two versions, Windows NT 3.1 and Windows NT 3.1 Advanced Server.
Originally, Windows NT was to be known as OS/2 3.0; the connection is actually quite intimate. Windows NT resulted from the fact that IBM and Microsoft decided to go their own ways with OS/2 after the success of Windows 3.0. Microsoft added a Windows-like API to "their" OS/2, on top of the OS/2 API, and christened the result "Windows NT" (mid 1993; there were a number of other differences between early Windows NT and OS/2, but the API was the principal one). IBM continued development of OS/2, with a more-or-less "native" API. Windows NT and OS/2 continued to diverge over the next few years. For more, see this excellent article on Windows NT: http://en.wikipedia.org/wiki/Windows_NT
Windows NT 4 did not have a specific codename. The changes between it and Windows NT 3.51 (codenamed Daytona) were mainly just a shell update. The shell update was created as part of the Cairo project.
Windows NT uses protection mechanism called rings provides by the process to implement separation between the user mode and kernel mode.
Windows NT 4.0