What is the CA IDMS Universal Communications Facility Option used for?
A DC/UCF system has an operator console that allows entering DC/UCF operator commands and task codes at the console at system runtime.
Application programs executing within CA IDMS/UCF environments can make database requests of the central version.
An application program executing within the CA IDMS/UCF environment can take advantage of the single region architecture of CA IDMS. Because the database and data communications services operate within a single address space, database requests do not need to be transferred across address space.
https://docops.ca.com/ca-idms-ref/19/en/ca-idms-system-tasks-and-operator-commands/dc-ucf-operator-console-interface/z-os-systems