/sys$common/syshlp/helplib.hlb Lexicals, F$GETDVI, Examples  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    1.$ ERR = F$GETDVI("_DQA0","ERRCNT")
      $ SHOW SYMBOL ERR
        ERR = 0  Hex = 00000000 Octal = 000000

      This example shows how to use the F$GETDVI function to return
      an error count for the device DQA0. You must place quotation
      marks (" ")  around the device name DQA0 and the item ERRCNT
      because they are string literals.

    2.$ LIBRARY/EXTRACT=$DCDEF/OUTPUT=$DCDEF.TXT SYS$LIBRARY:STARLET.MLB

      This example shows how to create a file, $DCDEF.TXT, containing
      a list of values for device types and device classes from
      the STARLET library. The device classes begin with 'DC$', and
      device types begin with 'DT$'.

      Note that most modern SCSI disks and tapes return the generic
      DEVTYPE code (DT$_GENERIC_DK or DT$_GENERIC_MK), therefore you
      should use the DEVICE_TYPE_NAME item:

        $ X=F$GETDVI("XDELTA$DKA0:","DEVICE_TYPE_NAME")
        $ SHOW SYMBOL X
          X = "RZ29B"