[Samba] Change somebody else's domain password?

[Genchev, Sergei]

 Hi,

 I am trying to find a way to change NT4 domain password from linux.
smbpasswd works fine if you know user's old password but I am looking for a
way to connect to PDC using all-mighty Administrator credentials and change
other user's password.
 I have searched all over the web in vain. Have anybody done that? How?
Maybe using tools other than Samba? 

 Thanks a lot,

Sergei