Every article posted on Usenet has a unique ID number. To post a public response, or follow-up. If selected while in a specific article, will follow up that article. In either case, you'll be asked if you want to include the original article in yours. N Goes to the next subscribed newsgroup with unread articles.
P Goes to the previous subscribed newsgroup with unread articles.
G news.group Goes to a specific newsgroup. Can be used to subscribe to new newsgroups. Will show you only articles with a specific subject. Will show you only articles from a specific person. M Mails a copy of the current article to somebody.