We have two different Laptops and one normal workstation where we work with ETS. Of course we have to pass the dongle to the system where we want to work.
It would be very nice to take the project data with the dongle. The best methode would be to same the project online corresponding to the dongle. So that you can take the actual data with the dongle to the computer you are actual working on. The other solution would be, to make the dongle an USB-Drive where you can save the data.