The `nt4` tag is used for the no longer supported Windows NT 4.0 version of the Microsoft Windows 32 bit operating system. Windows NT 4.0 is an older version of the Windows 32 bit line of operating systems (Windows NT 4.0, Windows 2000, Windows XP in chronological order) and is no longer supported by Microsoft. This tag is specifically for a question concerning Windows NT 4.0 operating system. It should not be used for any recent, supported Microsoft OS.
Windows NT 4.0 was a release of the Windows NT 32 bit operating system to replace Windows NT 3.51 in 1996. At the time, Microsoft was supporting two major versions of the Windows operating system: 16 bit Windows for consumer PCs (Windows 3.1, Windows 95, etc.) and 32 bit Windows for business server and work station applications (Windows NT 3.51, Windows NT 4.0).
Windows NT 4.0 was released in 1996 with user interface improvements from Windows 95 along with improvements to the Windows NE 3.51 operating system.
Windows NT 4.0 was followed by Windows 2000 which contained further improvements leading to Windows XP with the goal of eliminating the 16 bit versions of Windows and moving forward with only the 32 bit version of Windows for both consumer PCs and business workstations.
