I've received responses to newsgroup postings I made months ago. That's how an online newsgroup works. Most newsgroups are accessible to anyone on the Internet, anywhere. However, many are not. For example, Mindspring's local newsgroups, which include announcements, support, help, general discussions, and so forth pertaining to Mindspring itself, are accessible only to Mindspring subscribers.
Many universities have local newsgroups for internal use only.
Your internet provider surely has a newsgroup feed . Besides a feed, you need a newsreader . There are other newsreader programs for both platforms. A good ISP distributes a newsreader as part of their signup kit, along with a browser and an e-mail program. But if you do not have a newsreader, you can use your browser to download a newsreader.