Microsoft Windows XP   -   includes UDT versions 3.0 and above (UDT-XP)

How to Use Windows XP
Microsoft's one-stop shop for learning how to use the features and technologies that come with Windows XP.

Windows XP Professional Product Documentation
The Microsoft Windows XP Professional Product Documentation

Windows XP Support
The Microsoft Windows XP Support Center

Windows XP Pro Product Info
The Product Info site for Microsoft Windows XP Professional

Windows NT 4.0 Workstation   -   includes UDT versions 2.3 and below

Windows NT 4.0 Workstation at NPS
NPS documentation for Windows NT 4.0 Workstation

Windows NT 4.0 Workstation
The Microsoft Windows NT 4.0 Workstation Support Center

More Microsoft Links

Microsoft Updates
This site offers the latest security patches and updates for Microsoft Products (Windows, Internet Explorer, Outlook, etc.). You should regularly update your computer(s) with the latest security patches to prevent others from exploiting vulnerabilities in the Microsoft product line. (opens in a new window)

Microsoft Support
The official support site for all Microsoft products - Includes the searchable Microsoft Knowledge Base

Microsoft Select a Product Solution Center
Product support information, including common issues, frequently asked questions (FAQs), helpful links, tips and how-tos.