As a Domino server administrator, you can create a Cross-domain Configuration document on an as-needed basis. If you are not processing administration requests across domains, that is, from a source server in one domain to a destination server in another domain, there is no need to create this document.
If you are processing administration requests across domains, create this document on the source server in one domain and on the destination server in the other domain.
For more information on the Cross-domain Configuration document, see Creating a Cross-domain Configuration document.