1. If I purchase one then where i can find it after purchasing?
2. If I play with brother with one computer then when I buy two keys I need wrote them somewhere and always change them when I play and he plays?
Yeah, if you click set-up uyou can change your nick and key easily ;)
But like qegola said, its easier to download 2 versions of Toribash, and have a Nick and Reg key on either one.
They never clash, so it works perfectly...