samba + ldap question

hi guys,

i recently installed samba 3 + ldap in my debian box using phpldapadmin as
the configuration tool, i have it tested in one of our windoze 98 clients
and seems to be fine, my question is how will the users change the default
password i've given them in their windoze machine? or it can only be done
using passwd in my linux box?
currently we have 5 divisions in our bureau and i want users to belong to
their respective divisions, do i have to manually create the groups and add
the users to have read/write access to the group files? do i have to change
anything in ldap? samba?

TIA

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