Absolutely nothing.
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.
There are very few similarities between Windows 98 and Windows NT, other than a similar interface.
There is no difference between them. Some people call it 2000, some others call it 2000 NT. Windows 2000 is based on NT Technology, they are just different ways of calling one same thing. Windows 2000 offered several improvements over Windows NT, including a more stable environment, support for Plug and Play, Device Manager, Recovery Console, Active Directory, better network support, and features specifically targeting notebook computers. Pg 38
Windows 95 and 98 is based on the Windows 4.x Kernel. Windows 2000 and XP is baed on the NT Kernel. XP sports a different GUI compared to 95982000, this is the main difference between windows 2000/98 and XP.
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.
The GUI of Windows NT 3.1 to 3.51 is virtually identical to that of Windows 3.1. They use a Program Manager, rather than a Start menu and taskbar. Windows NT 4's GUI is similar to that of Windows 95. However, it lacks some facilities like the Device Manager (since NT 4 is not truly Plug 'n' Play). Unlike Windows 98, Internet Explorer is not integrated into the shell, although it is optionally available.
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 Microsoft Windows is used to describe Microsoft's flagship OS in general while Windows NT is an outdated OS that used to run on workstations and servers.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.
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.
The last version of Windows under the "NT" brand was Windows NT 4. The latest version to be built upon Windows NT is Windows Vista (Windows 7 has not yet been releasedofficially).
Basically, ME was a new coat of paint for Windows 98. It had a look similar to Windows 2000 and some added functionality over Win98, but also seemed to have a large number of reliability issues. ME was geared towards the personal computer user. Windows 2000 was developed from the Windows NT kernel, making it a far more robust platform. Since 2000 was developed more as a server operating system, it lacked some "personal" functionality, such as graphics and other function geared towards gamepley. Much of this is included in Windows XP, which is a more personal use extension of the Windows 2000 foundation.