@Starline meant to link to this:
Hint: there is a “link” button at the bottom of each post which makes it foolproof to get the right URL for a particular post.
Private messages (including the automatic one sent to each new user) are also essentially threads and get allocated a thread ID.
I think you meant something else other than this tautology.
You inadvertently linked to that post when you meant to link to the one below it.