UCFMD (University College Meta Directory) puts data from UMS up in the Knowledge Sharing Portal UCFMD, which is used by University Colleges.
Institution key: This is the key that suits the institution. This is provided by UCFMD to tell which UC to write to. Can also be for the test environment.
Mail domain: Which mail domain should be turned on for those sent via this option.
UC: Choose which UC you want to integrate. It is important to choose correctly as UMS uses this to configure the SQL calling to be used.