I am not really sure what it is called but. In many other sites when you just posted, and some other person post just after you. Today, i have to press reload page (f5) to see if there is a new post. On many other sites and message systems, there is no need to keep reloading page. Many sites/systems either says, "hey there are new post just now" or auto sync so, user dont have to press F5 to see if there is or is not any new post and the very thread you are ingaging in.