I have a question about the Application Rule. Exactly what is the move up, move down keys for?
It says in the help that it is used for priority. Exactly what do they mean by that?
Is it so that the application rules work like a chain, something like the global rule?
Yes, they are evaluated in order-priority is really how far up the list the application is. But usually it doesn’t make any difference, except within an application. I move them around for organizaton, so I can more easily find system, email, browser, utility, … related stuff if I want to work with the rules. Others have suggested alphabetical as an option.