>I need to create, modify and delete NT Users from VFP.
>
>ANy ideas where to start ?

You can use the ADSI automation objects to do this. If your machines are not running Win2K, you can download the ADSI package from msdn.microsoft.com, and it will install on any Windows platform (after 3.1).

oComputer = GETOBJECT("WinNT://MyMachineName")
lcUserName = "Erik"
lcFullName = "Erik Moore"
lcPassword = "smorgasbord"
lcDescription = "Programmer Type"

oNewUser = oComputer.Create("User",lcUserName)
oNewUser.Setinfo() && Adds the account. This line throws the error if the user exists, or if there's any other problem
oNewUser.SetPassword(lcPassword)
oNewUser.FullName = lcFullName
oNewUser.Decription = lcDescription
oNewUser.SetInfo() && Finalizes the settings

The ADSI object model for the WinNT provider is documented in MSDN.