Windows NT 4.0

Windows NT 4.0 (codenamed Cairo) is the successor to Windows NT 3.51 and the first version of Windows NT to feature the Windows Explorer interface introduced in Windows 95. It is the last version of Windows NT to include NT in its product name.

The Windows Desktop Update further enhances the shell by incorporating features from Windows 98.

Editions
There are two editions of Windows NT 4. It has been found out that the only difference between the two editions (Server and Workstation) lied only in the Registry and the missing Server files.

Workstation
Windows NT 4 Workstation was designed for general desktop use.

Server
Windows NT 4 Server (Server, Server Enterprise Edition, Terminal Server) were designed to serve web pages to multiple clients using IIS.

Terminal Server
Terminal Server edition (Codenamed Hydra) was released roughly a year after Windows NT 4's RTM. Its technology later merged into the Remote Desktop Protocol by Microsoft.

Service Packs
There were 6 service packs released for Windows NT 4. There was a 7th Service Pack Planned, but it was canceled and Update Rollup 6a was released instead.