1 SET_PREFERENCES
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This form allows you to set preferred values to use for various defaults,
such as the reverse address mapping directory name to use for a particular
directory service.

It is particularly useful to set these defaults using a DECNET_REGISTER
initialization command file, so that they will set up automatically
every time DECNET_REGISTER is started.

See the MAIN_MENU INITIALIZATION_COMMAND_FILE topic for more information
about initialization command files.
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2 Directory_Service
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This field specifies the directory service to use immediately after
startup.  The directory service can be changed when executing any
function.

The service must be one of:

    LOCAL
    DECDNS
    PHASEIV

The service type can be abbreviated, as long as the abbreviation is
unique.
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2 Phase_IV_Address_Prefix
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This specifies the AFI, IDI, and preDSP to use when constructing an
NSAP from a Phase IV address.  This is used when a Phase IV address is
specified for a node identification or in an address tower.

For example if the Phase IV address is "1.5", a Phase IV prefix value of:

    39:840:800AB738

results in the following NSAP being used to represent the DECnet Phase IV
address:

    39:840:800AB738-0001:AA-00-04-00-05-04:20

If any Phase IV addresses require the use of some Phase IV prefix other
than the value set using this field, they can be specified using a Phase
IV address syntax that includes the Phase IV prefix.  This will override
the default value specified in this form.  For example:

    1.5+39:840:800AB79

See the MAIN_MENU PHASE_IV_PREFIXES topic for details about Phase IV
prefix values.
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2 NSAP_Format
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This specified the format to use when converting NSAP addresses to a
text representation.  You can enter one of the following keywords.
These can be abbreviated, as long as the abbreviation is unique.

    DNA  - Use DNA text format
    OSI  - Use OSI text format

These formats are:

    DNA format:  <afi>:<idi>:<predsp>-<locarea>:<nodeid>:<nsel>
    OSI format:  <afi><idi>+<predsp><locarea><nodeid><nsel>

For example:

    DNA format:  39:840:0001:AA-00-04-00-05-04:20
    OSI format:  39840+0001AA000400050420
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2 Synonym_Directory
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This specifies the base directory or name entry to use when accessing
synonym mapping links in the specified directory service.

The links under this directory are used to map Phase IV synonyms to
their respective node names.  These are used only for the DECdns
directory service.

See the MAIN_MENU NAMES_AND_DIRECTORIES SYNONYM_MAPPING topic for more
information on these directories.
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2 Reverse_Address_Directory
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This specifies the base directory or name entry to use when accessing
reverse address mapping links (also called back translation links) in
the specified directory service.

The links under this directory are used to map NSAP values to their
respective node names.  These are used only for the DECdns directory
service.

See the MAIN_MENU NAMES_AND_DIRECTORIES REVERSE_ADDRESS_MAPPING topic
for more information on these directories.
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