If you just need to use it as the same user, but on multiple computers, then the license should be user-based instead of computer-based.
However, if you want multiple users to be able to use the license on several different computers, but just one session at a time - then you need what NI refers to as a concurrent license. There are multiple problems with such licenses though (as far as I've understood them, there is not much documentation available);
1. They cost about twice as much as a user-based license (!), and
2. The users do not get an extended "grace"-period for their secondary machine, so if they need to travel and have LabVIEW running on their laptops, they cannot bring the license with them...
Personally I find both of these to be show-stoppers, but the latter one is the worst of the two. If that limitation was removed, and the license cost was the same, or maybe just 10-25% above the regular licenses...I would have bought some for our company.
