Followup N.
[common] On Usenet, A Posting
Generated In Response To Another Posting (as Opposed To A
Reply, Which Goes By Email Rather Than Being Broadcast).
[common] On Usenet, a posting
generated in response to another posting (as opposed to a
reply, which goes by email rather than being broadcast).
Followups include the ID of the parent message in their
headers; smart news-readers can use this information to present
Usenet news in `conversation' sequence rather than
order-of-arrival. See thread.