Before you write, why not take a look in the FAQ first?
You may also like to ask the good people of SABRE too - they may well get back to you far faster than we can. Please also bear in mind that we're ever so busy here at PM Towers, and it sometimes takes us forever to get through the pile of emails that arrive. We try to answer everything, but if it's in the FAQ, or if there's just nothing we can say as a response, we might just forget...