I have users in:
             OU=People,OU=United States
And also in:
             OU=Service Accounts,OU=Hosting,OU=People,OU=GM,OU=Service Provider,OU=Domain
How do I search for a user in both of these locations, at the same time?

How do I search for users in two trees/locations within the same Active Directory?

(1)   Back up the file CIS_INSTALL\conf\server\ldap.properties
(2)   Open the file with a text editor.
(3)   Edit the filters to specify the two locations that you want to search in, separated by a pipe symbol (i.e.|).
       The pipe acts as an OR operator.

Example
            OU=People,OU=United States | OU=Service Accounts,OU=Hosting,OU=People,OU=GM,OU=Service Provider,OU=Domain

tells the LDAP server to search in:
            OU=People,OU=United States
or in:
            OU=Service Accounts,OU=Hosting,OU=People,OU=GM,OU=Service Provider,OU=Domain4

Note that you do not need to restart the TIBCO Data Virtualization server after making this change. Not requiring a restart is very helpful as it means that you  can modify any filter values, and test them out instantaneously.