If You're asking regarding Bulletin Board Systems.. it's something that existed far before the Internet... de facto back in the times people communicated to each other via modem connections ... and that was where the software has been used... it still persists into this time... You can still connect to BBS .. now via Internet ... bbs list is here https://www.telnetbbsguide.com/
You are welcome. Is it something like a forum software?
If You're asking regarding Bulletin Board Systems.. it's something that existed far before the Internet... de facto back in the times people communicated to each other via modem connections ... and that was where the software has been used... it still persists into this time... You can still connect to BBS .. now via Internet ... bbs list is here https://www.telnetbbsguide.com/