switch databases in a MSSQL connection?

I have a dfconnid=TheApplication, which points to -> TheApplicatioDB I want to switch to TheApplicationDB_2020, which is a copy of theApplicationDB.

Where in the sacred texts is it written how to close all files, change databases, and open all the files up again? I know I've seen this, but I know not where, and it's 4 o clock on a friday afternoon (almost) so..


TIA

Michael.

/MM