samba - Mar 2006 - Samba LDAP gidNumber=-1 queries?

Greetings,

using samba-3.0.20b.

I've been doing some packet traces of Samba's LDAP queries, and I notice
that it does a lot of queries on various idmaps for gidnumber=-1 before 
it performs functions. What happens if this object is present in the 
directory? Does it disable functionality? It'd be good to know if it 
provides a system-wide disable feature.

Thanks.

-Justin Grote