If you know exactly what you are searching, this is the best place to start with! Let 's say you need a specific information about "Niche Directory". You click on the letter "N", then " Niche Directory " ...et voilà! Any type of document, PDF, EXE, MP3 and so forth will be listed there IF it is about " Niche Directory "! If you don't see the 26 letters, it is because there are no documents yet under all of the letters of the alphabet! Last! When there is this sign "@" before a category, it is a virtual category. I called them " Beam Me Up Scotty " categories. Once clicked on, it will teletransport you to another relevant section of the library!