Could someone explain how this logon could be extended to become a simple installation registration? Yes, I realize this would not be a secure registration, but it would definitely cut down on very very casual piracy. For example, after the user entered his name and password, this would be compared with a registry entry which was written when the program was installed. If the logon info matches the installation info, this would also set another registry entry which in the future would bypass the logon screen. It would also be good to have a way to delete the registry entries.