Implementing unique user ids allows for additional capabilities with regards to FEPI connections to back-end applications. With unique user ids,CICS® Service Flow Runtime FEPI Nodes or SLUs can be used in one request, left assigned to the unique user id, and reused in subsequent request processing. The application may be left in-transaction at a particular screen as modeled. This may achieve performance gains because CICS Service Flow Runtime FEPI sign on processing to back-end systems is not required on each and every request that requires CICS Service Flow Runtime FEPI processing.