The internally maintained "current article pointer" is set to the previous article in the current newsgroup. If already positioned at the first article of the newsgroup, an error message is returned and the current article remains selected.
The internally-maintained "current article pointer" is set by this command.
A response indicating the current article number, and a message-id string will be returned. No text is sent in response to this command.
223 n a article retrieved - request text separately (n = article number, a = unique article id) 412 no newsgroup selected 420 no current article has been selected 422 no previous article in this group