Password Changing

[Mark Bannar-Martin]

I am using samba 2.04b with encrypted passwords. Win9X clients can
change their smb password using the  standard Win9X password change
dialog. I want to be able to disable password changing. A small barrier
can be put in users way by disabling password changing at the windows
end by altering the registry. However I want something like the WinNT
server disabling of password changing. Is this possible on
a) all samba accounts
b) selected samba accounts

How is it done?
Regards,
Mark