What most people mean
I expect most users use 
to mean that they’re watching the topic with interest.
What I mean
If I don’t have an immediate response to the comment (or if it doesn’t warrant a comment), sometimes 
or 
isn’t really appropriate (especially for bug reports), so I use to show you that I saw and read the post, and, if relevant, am trying to figure out how to debug and solve the issue.
In other words, I use as a way to ensure you that I did, in fact, see what you wrote.
Bookmarks
I also, most likely, bookmarked your post if I didn’t take care of it immediately. Bookmarks can be used as reminders, (but feel free to bump the topic if I don’t resolve your issue and you think I’ve dropped the ball).
If you haven’t used the bookmark feature in this forum, it’s pretty nifty:
- Click the
in the bottom right of a post - Click the
bookmark icon, and select a time to be reminded.
When the timer elapses, you’ll get an email or notification within the forum, showing as a counter on your avatar in the upper right corner. I’ve got 6 pending issues right now:
