Have lists are a powerful feature that allow you to track your software collection along with information about your games such as the condition of the box, the state of the media and free form comments. If you are interested in trading games, have lists will help hook you up with other serious traders.
In order to set up have lists, you must first log on. If you don't yet have an account, go ahead and create one. Have lists are reason enough to create an account and become a registered MobyGames user. However; that's just one of the many benefits of creating an account.