[otrs] A few questions

Hi I have been testing out OTRS and want to know if you can view closed tickets, or open tickets that was assigned to a specific queue and has been closed for example. When I look at the agent interface I can only see options to view the queues that have messages in a live/open state. Is it not possible to view queues which do not currently have live messages, but might contain closed cases etc? I also want to know if it is possible to reset the Full Qualified System name that you need to enter when going through the configuration pages after you have finished doing so. I do not really want to reinstall. Thank you, Gian