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

 search_devnam

    Specifies the name of the device for which F$DEVICE is to search.
    The asterisk (*)  and the percent sign (%) wildcard characters
    are allowed in the search_devnam argument.

    Specify the search_devnam argument as a character string
    expression.

 devclass

    Specifies the device class for which F$DEVICE is to search.
    Specify the devclass argument as a character string expression
    that corresponds to a valid device class name.

    See the DEVCLASS item in F$GETDVI for additional information.

 devtype

    Specifies the device type for which F$DEVICE is to search.
    Specify the devtype argument as a character string expression
    that corresponds to a valid type name.

    See the DEVTYPE item in F$GETDVI for additional information.

                                   NOTE

       Specifying a device type without specifying a device class
       will result in an error.

 stream-id

    A positive integer representing the search stream identification
    number.

    The search stream identification number is used to maintain
    separate search contexts when you use the F$DEVICE function more
    than once and when you supply different search criteria. If you
    use the F$DEVICE function more than once in a command procedure
    and if you also use different search criteria, specify stream-id
    arguments to identify each search separately.

    If the search criteria are changed in a call before the device
    name list is exhausted, the context will be reinitialized and the
    search will restart.

    If you omit the stream-id argument, the F$DEVICE function assumes
    an implicit single search stream. That is, the F$DEVICE function
    starts searching at the beginning each time you specify different
    search criteria.