I am in the middle of doing an Erase and Install of Tiger on my PowerBook. It's formatting as I type. However, I forgot to deauthorise my iTMS account on the machine. I have already notched up 5 registered machines. My first question is, when I get iTunes up and running again, will I be able to still play iTMS purchased music on it, from my other machine? Considering I'm already up to five registered computers. What information is taken from the computers? OS version, serial number? If I can't, how can I manually deauthorise it?