Keeping track of licenses on multiple machines

I own 3 copies of NIS 2012. Of course I have it installed on multiple machines.

How do I keep track of which licenses are tied to which machines.

I've re-tired a couple computers so I need to move the license over to the new computers

 

I went into NIS on the machine looking for the serial numbers or keys so how can I figure it out?

 

Thanks

 

I own 3 copies of NIS 2012. Of course I have it installed on multiple machines.

How do I keep track of which licenses are tied to which machines.

I've re-tired a couple computers so I need to move the license over to the new computers

 

I went into NIS on the machine looking for the serial numbers or keys so how can I figure it out?

 

Thanks