I was using some kind of messaging system and there was a conversation going on about technical issues. I'd just gotten a reply to something I had said.
reply: (written) "Well, all right. But you wouldn't be changing the software at that point--you'd need to fundamentally change the computer itself."
I wanted to post some kind of reply to it, but I was taken to an information screen explaining that the thread had been closed. I had two options: I could either "start a new thread" or "enter a reply in the sender's own time."