SYSMAN> IO SHOW DEVICE

      The following example is a sample display produced by the
      SYSMAN IO SHOW DEVICE command:

        __Driver________Dev_DDB______CRB______IDB______Unit_UCB_____
        SYS$FTDRIVER
                        FTA 802CE930 802D1250 802D04C0
                                                         0 801C3710
        SYS$EUDRIVER
                        EUA 802D0D80 802D1330 802D0D10
                                                         0 801E35A0
        SYS$DKDRIVER
                        DKI 802D0FB0 802D0F40 802D0E60
                                                         0 801E2520
        SYS$PKADRIVER
                        PKI 802D1100 802D13A0 802D1090
                                                         0 801E1210
        SYS$TTDRIVER
        OPERATOR
        NLDRIVER

      SYS$TTDRIVER, OPERATOR, and NLDRIVER do not have devices
      associated with them.