>How do I close the database in order to "Use databasename.DBC Exclusive"? When I "use..." I get "file is in use", and I can't find a way to close the database.

Is the project that has the database open in VFP when you get that error? If so, close it. I think you can also just select the database in the Project Manager and click "Close", although I usually just close the project itself, just to be sure.