After a server reboot from scratch . . .

  When a newsserver gets wiped clean and built from the ground up,
  like after the machine bites the dust, the articles in a newsgroup
  might end up with new numbers slapped on them, from what I know.

  So if a client's been keeping tabs on what it's already peeped,
  thinking "I've already eyeballed article number 1 from Group G",
  that info's now totally out to lunch.

  The client oughta treat this reborn server like it's fresh off
  the lot, even if it's rockin' the same web addy as before. But
  I reckon the user's got to step in and work some magic themselves.

  Or is there already some kind of official playbook for this
  scenario, where the server can give the newsreader a heads up
  via the NNTP protocol that it's sportin' a whole new article
  numbering in the newsgroups?