This is a feature provided mainly for the fiddle factor. Again, this really is not that useful, except for fiddle factor. I prefer 'Id-Index' as the name I use. That is all of the global options. Each of this options apply ONLY to the newsgroup they are listed after.
All options are, well, optional, unless otherwise stated.
The name of the newsgroup being archived. The description of this group - I personally try to use the same descriptions as given to the groups on the Usenet, but you don't have to. This option is used to turn off the hotlinking of URLs contained in messages and italicizing of text that appears to be quotes from other messages. This option is used when, for one reason or another, no active file of newsgroups is available for a newsgroup. This might occur, for example, if you were obtaining the articles from a newsgroup via mail or other non-local mechanism and then storing them to a directory for archiving.