Microsoft has developed extensions for the Windows? 95, Windows 98, and Windows NT? 4.0 operating systems that allow those client platforms to take advantage of features provided by the Windows 2000 Active Directory service. These client extensions were developed for those who wish to deploy Windows 2000 Server in environments with Windows 95, Windows 98, and Windows NT 4 based client workstations.
Windows 9x and Windows NT 4 based clients lack many of the features of Windows 2000 Professional that are related to Active Directory. The Active Directory client extension is an upgrade or patch for Windows 95, Windows 98, and Windows NT 4.0, which enables the following Active Directory features:
Note: Active Directory Client extension provides necessary APIs to change the password to any Windows 2000 based domain controller.
See link to whole article, more explanation and additional links:
http://www.microsoft.com/windows2000/server/evaluation/news/bulletins/adextension.asp
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