I could be wrong but I believe you can have only one PC registered with a single license at a time. If you de authorize an active system then you can free that license register on another PC. I have seen several users here who have bought a second license for use one another system.
It seems to go by the activation of the key. If BI is not in use the key is still activated. If you deactivate it then you can use it on another computer. I am not sure but if you activate/deactivate every time you want to switch computers you should be able to do it.
I figured activate/deactivating would have a limit. How many times? I have done it a few times when working with new computers to test it before buying a new license.
And yes - it is $35 for another license it seems (half-off). This is nothing. I don't get the big hangup on the low cost of this great software.
Hmm.. I have done it at least 3 times already and was about to change hardware again.
I was piloting on a VM, and it was running nicely, should have left it on a VM.
Thank you all for the responses. I just bought a well equipped, small size mini-computer and re-installed BI. Now I can easily move it around, to different locations just like a laptop.