Nope, that is not the purpose of topics. Anyone can post on any thread. No one has the right to exclude anyone from any thread. Its just a way to classify and sort articles. Libraries classify books so that they are easier to find. But anyone can check out and read any book. That is the same thing we are doing here.
Trust me on this Ang...Mac accused some of Highjacking a thread yesterday...It is a given that it will happen.......and happen alot..