You need a newsgroup browser first
found through our wonderful search engine:
If you sign up with a good newsgroup provider (eg. GIGAnews.com), then u can go to the alt.binaries.*** groups
I think if you start with these links and read the helpfiles of the mentioned newsgroup readers you'll find a lot of information, don't know if it will answer all your questions.
alt.* is just a catagory of newsgroups, there are soooo many. It is like www.* signifies a web address and ftp.* a FTP address.