> I guess they might use [UDP] for DHT control messages
And IIRC that's exactly what they use UDP for.
The subreddit had a lot of good info last I checked (a few months).
Note that there is no "max comment depth" on HN, and I don't know where this thought keeps coming from. There are a few reasons the "reply" link may not be shown:
- The comment was posted too recently, and you need to wait for the cooldown to expire. This is proportional to comment depth. It's said this is a flamewar prevention mechanism.
- The comment is too old.