VMS Help LANCP, DEFINE, DEVICE, Parameter  *Conan The Librarian (sorry for the slow response - running on an old VAX)

 device-name

    Supplies the name of a device to be added to the LAN permanent
    device database or an entry to be modified. The device name has
    the form ddcu where dd is the device code, c is the controller
    designation, and u is the unit number. LAN devices are specified
    as the name of the template device which is unit 0. For example,
    the first PCI Ethernet device is specified as EWA0, the second as
    EWB0.