There are the "Show unread posts since last visit" and "Show new replies to your posts" links at the top of the page. Is that what you're talking about?
No I'm afraid that's not what I'm talking about
I've included a screenshot, but basically I'm asking if their is a way to label posts we haven't read.
As it is all we know is a thread was updated, and generally that means to go to the last page and try to find where you last were.
But if at all possible I'd appreciate knowing for sure.