DECNET_REGISTER_FORMS.HLB  —  SET_PREFERENCES
 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.

1  –  Directory Service 

 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.

2  –  Phase IV Address Prefix 

 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.

3  –  NSAP Format 

 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

4  –  Synonym Directory 

 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.

5  –  Reverse Address Directory 

 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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