Sub domains and OU properties.

[gob]

I have a multi-domain forest (Win2K) with a directory asp application running on a DC at the root domain. I plan to query the Active Directory on the root domain to provide staff details via the website. I am able to get a list of users that are members of the root domain using the following query:

SELECT telephoneNumber, name, mail, title FROM 'LDAP://192.168.5.2/OU=Staff,DC=mycompany,DC=com' WHERE objectClass='user'

Should it be possible to query the same root server to get users from a sub domain e.g.
LDAP://192.168.5.2/OU=Admin,DC=site1,DC=mycompany,DC=com' WHERE objectClass='user'

I can query the sub domains directory if I change the ip to look directly at their GC, but I thought the root domain would also keep a copy of the sub domain's active directory.

I don't want to query our eight different sites just to get a staff list if it can be avoided.

Also is it possible to get the properties of an OU to get the site address info?

Many thanks