Windows Integrity Levels (or WIC) is a system that can label an object with an integrity level. There are six such levels:
- Trusted Installer
- System
- High
- Medium
- Low
- Untrusted
WIC is available on Vista and Windows Server 2008.
Mark Minasi has an interesting article about it and a tool that allows you to work with these levels. The tool, chml, has more options than the built-in icacls.exe command. Check out the article here.



