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  1. Introduction
  2. Capabilities
  3. Structure
  4. The Registry
  5. System and Configuration Files
  6. Security
  7. Application Support
  8. Requirements
  9. Installation
  10. Unattended Installation
  11. Booting
  12. Filesystems
  13. Programs
  14. Control Panel
  15. Tool
  16. Commands
  17. Customization
  18. Environment Variables
  19. Printing
  20. Performance
  21. System Services
  22. Permissions
  23. Groups
  24. User Rights and Auditing
  25. User Profiles
  26. Policies
  27. Network Model
  28. Resource Access
  29. Network Browsing
  30. Protocol Support
  31. RAS
  32. Networking
  33. Backups
  34. Events
  35. Error Handling
  36. Diagnostic Tools
  37. Items to Memorize
  38. Terms
  39. Credits

Windows NT Environment Variables

NT Environment variables are stored in the system registry. They help NT find programs and control programs. There are environment variables used by the system which are modified by administrators. User environment variables are used to customize settings for users. The Environment tab in the System applet in the control panel is used to change environment variables.

Variables

  • %HOMEDIR% - The userís home directory.
  • %HOMEDRIVE% - The home directory share logical drive.
  • %HOMEPATH% - The userís home directory folder path.
  • %HOMESHARE% - The folder share name containing the userís home directory folder.
  • %OS% - The operating system being used on the user's computer.
  • %PROCESSOR% - The CPU type of the machine.
  • %PROCESSOR_ARCHITECTURE% - The user's computer's processor architecture, such as Intel.
  • %PROCESSOR_LEVEL% - The user's computer's processor type, such as 486.
  • %USERDOMAIN% - The NT domain name of the account the user is logged into.
  • %USERNAME% - The userís ID in the form of the username.

System environment variables are specified in the NT workstation study guide or a DOS manual.