this is a multi-step process, you need to get the 'drivers' for the 'kvaser leaf light' from the kvaser website, and get that recognized by the computer, then you will be able to "talk" between the computer and the usb+can, then you get the truck service tool to run, then you have to "update" the truck service tool on first run to get the trucks loaded.
I am not positive the kvaser usb-can tool works with hyster-yale products even though it plugs up, but that would be what is required with the IFAK USB-CAN tool.