Are you asking if the page will refresh on your end when I make my post?
If that's the case, then the answer is "technically yes, but I wouldn't recommend it". You could have a small AJAX script poll the server every x interval to see if there are new topics/replies and refresh the page if there is, but I wouldn't recommend it. I (and many users) don't want my browser doing things I didn't initiate in most instances.
If you're hell-bent on this line of thinking, look into what StackOverflow.com did with the notifications - that way the user can choose to refresh the page or not.
you can't refresh one page based on the actions performed on another, active.asp has refreshing built in and is designed for the purpose that you are trying to achieve.