samba - Mar 2006 - How do I change samba password from windows in sarge

Hi folks,

we have a lan with win and linux clients (pcs work alternating between 
win and linux-ubuntu, server is sarge). Authentication in linux works 
with nis. Therefore I substituted passwd by yppasswd. How can y realize 
password changes in win to get the linux (yp) and the samba password 
changed in one step?
By the way: do I have to substitute passwd by yppasswd on the server too?

Thanks in advance, Klaus