Just wondering what this is, exactly....can anyone help?

Nodelocked version is the Vue version that is bound to your computer (and a second one that you own). Classical serial number entrance and activated for the machine you are working on.

In differnece to that is the floating license. This expects a network with a server running. On that server there is a licence server program running that shifts the license keys you own to the machine where Vue is started. And allows as many running copies of Vue as you own license keys. This is intended to production facilities where people are used to do work on different machines.

It means that the license is for a single machine (but can be activated on your laptop as well your main machine).

The alternative of a floating license, is really only for when you have more than two copies which need to be run on multiple machines at the same time, i.e. unless your a multi-person studio, you almost certainly don't need a floating license.

Sorry that I come back to that. For me as non native English nruddock's explanation sounds a bit as if you can run more copies with a floating license than you have bought. You definitely can not (I have a floating license). You can only run as many copies of Infinite the same time as you have licenses. The benefit is that the license is "shifted" to another machine when you need it there.