Thank you everyone for all the tips. I'm rather new to it all and I'm using Nero too so some will be very helpful.
I have another related question. I think it's related. I am having a CD commercially copied, after bravely doing the recording and mastering myself, and here in Australia they use a different process for short runs. (That's all I can afford) I understand that larger quantities are made from a "glass master" (whatever that is) My worry is that there is a small (they tell me) - number of systems that cannot play cds made by the short-run process. Does that all make sense? I feel I have a responsibility to my fans and friends. Should I worry do you think?