Using Cross-Enterprise User Assertion (XUA) Cross-Enterprise User Assertion (XUA) is supported in InterSystems products. To accept an inbound message, you must extend HS.HC.IHE.XUA.ProcessorOpens in a new tab and implement the ProcessRequest() method, where inbound user data is authenticated. To send a message, you must extend HS.HC.IHE.XUA.CreatorOpens in a new tab and implement the following methods: FetchUserOrganization() provides organization lookup FetchUser() provides lookup of individuals