who is Susan? I'm not sure but maybe this should have been in a private message if it's sensitive. You should also consider removing your email address and phone number from your post. This is an open, public forum and scammers look for information like that.
A spreadsheet program running on a desktop PC is as far from a real-time computing application as you can get. It is by definition a single-threaded process. You cannot add train cars to a train whilst it is moving, and you cannot add data without pausing a process...and other than using a DOS batch file, updating Excel via a macro is the slowest train on the planet.