device-name[:]

    Supplies the name of a device over which the network connection
    is made. 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 device that is unit
    0. For example, the first terminal device on a LAN is specified
    as TTA0, the second as TTB0.