[Samba] Disable password change!

[Andrej Javorsek]

Hello!
This is my first post to this list!   ;)

I have a question regarding password change. I'm using samba as PDC, and 
I would like to disable password change for specified user.
I'm using domain logon in the classroom (single user loged on multiple 
computers) and would like to prevent users to change (domain) password
via Windoz "Change Password" routine.

Regards
Andrej