>The User Manager on Windows NT4 lists all Users and User Groups.
>
>Is it possible to retrieve this information in Visual FoxPro 6 using an API call ?

Use Active Directory Services Interface. Do a search in the Microsoft Knowledge Base (http://support.micrososft.com) on VFP and ADSI, and you should get back a half dozen articles on using ADSI. You might specifically want to look at the ADSIBrowse.exe sample. If I remember correctly, the browser sample has code in it to spin through the users and groups of a domain.