Yale University Divinity School Library has an interesting website with a Bible Reference Tools Tutorial which offers interesting introductory information about most of the reference works that are usually available in different Bible software packages. Some examples are taken from BibleWorks and Libronix Digital Library System -- not necessarily the latest versions! --, but it makes good reading irrespective of the software you may be using. I recommend this link because I've noticed that some people don't really know how to make full use of concordances, lexicons, etc., and that is absolutely crucial if we want to study and do research with Bible software adequately. The more we know about the tools of our "trade", the better.