How to I link to PART of a thread?

I know how to link to a thread using all that [url] guff - but how do I link to a certain point in a thread?

To show what I mean, have a look at the link in the OP of Libertarian’s post.

The URL for Libertarian’s link has a bunch of stuff at the end that seem to point to a specific message in a thread. Where have these numbers come from?

[sub]Apologies for the god-awful sentences there.[/sub]

sirjamesp check in this thread, which explains exactly how to code this. Then practice it here.

Kind of circular

Many thanks ShibbOleth - I feel like a doofus for missing the info you linked to. Hell, it was only posted a month ago!