The Online Licensing licensing system allows you to use seats associated with your Chaos Group account easily from anywhere you can log into over the internet. If you also have a V-Ray USB License license dongle attached to your workstation/server, you can utilize those available licenses within with the online systemLicense Server.
Note that there might be some delays in detecting a dongle when it is plugged in. If however a dongle is not recognized at all by the system after plugging it in, try disabling and re-enabling the dongle subsystem.