Hm The Livrary is a good place to confuse people. In Cluedo it s where murder wmay well be comitted. It is also where you can keep an eye on the interest in your shared files, and where you can see your incomplete files listed. This last is the only time I use the Library, although there is a nother use that I forgot. It is where you can control the limewire player, but I never use it.
I don't know if you have seen the user guide, but it is pretty helpful, and you can down load it as an adobe reader file if you want.
http://www.limewire.com/english/content/userguide.shtml