Since you don't have access to the server's hard drive, you can't make real folders and real files. Since they're not really folders and files, they're called categories and stories here. Here you'd create a category named foo, a category named bar, and a story named bar. One of the differences is that we get to make up tag names. This is the number of the story you want to appear there.
Every story has a number.
Every discussion group message has a number, and stories are just a type of discussion group message. You can make this feature work better by giving your stories descriptions. Custom category pages You might not want an automatic listing on your category pages. While the automatic listing is helpful, it's not necessarily how you want these pages to appear. Take note of its msgNum.