Knowing that VHA might be switching over to Cerner, and knowing that Cerner has a FHIR sandbox available... He directed his Vista FHIR Client to speak to the Cerner sandbox FHIR Server. With only making the endpoint configuration and security token settings; he found that his Vista instance worked almost flawlessly. This system was not designed to work with Cerner FHIR Server... BUT... because FHIR is actually delivering on Interoperability, by being simple and well defined, the system just worked.
When I presented that I am part of the FHIR standards development team, he wanted me to know how overly excitedly happy he was at this experience. He expressed that he has had long experience with networking standards, including HL7 v2, CDA, and others. He wanted me to know that "FHIR really was [positively] different."
I have no idea what will happen with this pilot. It was not part of the VHA Lighthouse project. It was also not part of the FHIR work going on with MyHealthVet (The project I am now assigned).