Norton AntiVirus 11 on Mac OS X Server - does a user need to be logged in?

Hello, we have a site license for Norton AntiVirus and our auditors have requested we install Norton AntiVirus on our Mac OS X Servers (10.4.11 and 10.5.8); however we've found that it doesn't scan or update without a user logged in. Is this true? If it is - is there some kind of documentation I can point the auditors to so they can understand?

 

Any additional information would be helpful.