The 1018 PhidgetInterfaceKit can't connect directly to the VINT Hub Phidget, but it can be connected to the same computer that's controlling the VINT Hub.
If you were under the impression that you could connect 3 PhidgetInterfaceKits to your VINT Hub, perhaps you were thinking of the
SBC3003, which has it's own VINT Hub and 3 USB ports?