When searching for concepts in an openmrs installation, you should see ajax results from the occ. A small box off to the right that says "these are the results from the occ" would suffice.
A similar box would be needed when an admin is creating a new concept in their system.
The box should allow the admin to via more details about a certain concept (like datatype, class, # of other mapped installations, etc).
The admin should have the option of "use this concept" with creates a new concept in their system and sends a note back to the occ to map it to that one that they selected.