I do believe that this has been talked about in a similar fashion here before.
And I hope someone will correct me if I'm wrong, but I feel quite confident in telling you that...
Example: Let's say your at home... you have a laptop and a desktop. You may download "Impulse" to both computers and use the same serial#.
This is a personal use thing... and should not be expanded upon. (that said with the assumption you know the proper rules and laws of this topic.)
Now with all that being said, (less confident)... I THINK that the "standalone" serial# becomes mute.
For more info you can refer to this thread...LINK