The property 'ad-ldap-base-list' in ApplicationSettings.properties specifies the DN of the node(s) to search. Multiple nodes can be specified by delimiting multiple DNs using %% (or whatever string you have set for the property 'ad-delimiter'). 

For example, the setting below shows how to search across two nodes:

ad-ldap-base-list=CN=Users,DC=win2000server,DC=local%%CN=Users2,DC=win2000server2,DC=local2