Databases are available 24 hours a day, 7 days a week. You can use them on or off campus. If you are using them from off campus you will be prompted to put in your SU username and password (the same one you use for Gull Net, MyClasses, or an SU computer).
You can filter your search in SURF to just Articles if you know what kind of source you need, isn't that helpful? You can select that filter yourself or use this nifty search box which is already set to only look for articles.
You can search for databases by name or by subject.