With more and more people asking this in threads I thought it a good idea to start a thread on these topics. Why all in one thread? Well to get rid of some of the confusion over these issues. This thread is open to all, but it would be good to have contributions from tbose who know about these issues. It would also be good to keep the thread quite clean as in no off topic chat. If people have links to useful info I will add them to this post. I know a little about these issues but it would be good to have a more indepth knowledge if those that have it would like to share.