dragontales, this is just how I understand the issue from what I've read.

1. Yes, you need a new unlock code for each seperate machine.

2. No, you can reinstall the software on the same machine as many times as you want, without needing to enter the original code at all. It stores this information on your hard drive the first time, and will read it each time you reinstall.

3. Each new machine you install it on, it writes a seperate lock code on your hard drive. Each seperate lock code requires a specific unlock code to uninstall it.

4. I beleive you do need to register your program, at some point within the grace period, in order to use it after the grace period is up.