o  data link error

    An error was reported by the Data Link layer on the boot command.

 o  unrecognized client

    There is no client with the specified identification on the boot
    command.  Run net$configure to add this client to the MOP Client
    database.

 o  required argument omitted

    Address and Circuit information must be provided either on the
    command line or in the MOP Client database.

 o  process failure

    There is no circuit with the specified identification.  The
    circuit provided in the command does not exist, or if no circuit
    is provided in the command, then the circuit provided for that
    client in the MOP Client database does not exist.

 o  entity class not supported (OpenVMS)

    MOP is not registered with EMAA.  The NET$MOP process is
    probably not started.  For instructions on how to restart the
    NET$MOP process, refer to HELP NETWORK_MANAGEMENT MOP.