[Samba] How sambaLMPassword attribute updated?

[ITPFS oota]

When giving information to the LDAP side by samba+LDAP cooperation, 
Samba 3.x stores LANMAN password into sambaLMPassword.

Usually, Windows NT(2000,XP etc...),Samba uses ONLY sambaNTPassword,
and not use sambaLMPassword.

My Question is:

Where is Samba controlling the conditions of not using sambaLMPassword?

When I set client lanman auth = yes ,but not use sambaLMPassword.

--
--- Oota Toshiya ---  t-oota at dh.jp.nec.com
NEC Systems Software Operations Unit      Shiba,Minato,Tokyo
IT Platform Solutions Division            Japan,Earth,Solar system
(samba-jp/ldap-jp Staff,mutt-j/samba-jp postmaster)