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Annotation of 43BSDTahoe/new/notes/doc/3.1, revision 1.1

1.1     ! root        1: .ls 1
        !             2: .ch "Managing Notesfiles"
        !             3: 
        !             4:        The notesfile system is installed by a user who is known as the
        !             5: ``owner'' of the notesfiles (UIUCDCS uses user ``notes'').
        !             6: This user can create, delete, rename, and initiate networking of notesfiles.
        !             7: Each notesfile is assigned a set of ``directors'' (who may or may not be
        !             8: associated with owner of notesfiles).  The directors have special privileges
        !             9: for managing the notesfile (see below).
        !            10: The ``owner'' rarely manages the day to day aspects of a notesfile,
        !            11: although he has director, read, write and response privileges to
        !            12: all notesfiles for
        !            13: handling emergencies and failures.
        !            14: 
        !            15: .se "Director Options"
        !            16: 
        !            17:        The director can:
        !            18: 
        !            19: .bx
        !            20: .ix
        !            21: Change the access permissions.
        !            22: .ix
        !            23: Write the policy note.
        !            24: .ix
        !            25: Change the notesfile title and director message.
        !            26: .ix
        !            27: Open or close the notesfile.
        !            28: .ix
        !            29: Allow the notesfile to be networked.
        !            30: .ix
        !            31: Permit or restrict anonymous notes.
        !            32: .ix
        !            33: Compress the notesfile.
        !            34: .ix
        !            35: Change the notesfile's archival parameters.
        !            36: .ix
        !            37: Delete notes and responses.
        !            38: .ix
        !            39: Toggle director message on any note or response.
        !            40: .ex
        !            41: 
        !            42:        The director can delete notes or toggle the director message
        !            43: above them while reading the notes.
        !            44: Access other options
        !            45: by typing ``d'' on the index page.  A display like this results:
        !            46: .KS
        !            47: .nf
        !            48: 
        !            49: .ce 99
        !            50: Workstation Discussion
        !            51: *** Your Director Message Here ***
        !            52: 
        !            53: .ce 0
        !            54: .ta 3i
        !            55: (a) Anonymous:   ON    Policy Note Exists: YES
        !            56: (o) Notesfile:   OPEN  Next note in slot: 1
        !            57: (n) Networked:   YES   Deleted Notes (holes): 0  
        !            58: (A) Is Archive:  NO    Deleted Responses (holes): 0  
        !            59: (e) Expiration Threshold: Default
        !            60: (E) Expiration Action:    ARCHIVE
        !            61: (D) Archive with Dirmsg:  NOCARE   
        !            62: (W) Working Set Size:     Default
        !            63: (l) Maximum Text/Article: 65000 bytes
        !            64: .TA
        !            65: 
        !            66: 
        !            67: 
        !            68: 
        !            69: 
        !            70: 
        !            71: Option:
        !            72: 
        !            73: .ce 99
        !            74: = = = = = = = = = = = = = = = = = =
        !            75: .ce 0
        !            76: .fi
        !            77: .KE
        !            78: 
        !            79:        Options available on this page include:  access lists, policy
        !            80: note writing, title & director messages, open/close notesfile,
        !            81: network enabling, anonymous notes, notesfile compress, and delete
        !            82: a list of notes.
        !            83: 
        !            84: .ss "Access Lists"
        !            85: 
        !            86:        The notesfile system allows directors to allow or restrict access
        !            87: to each notesfile.
        !            88: The access list can allow or deny read, write, respond, and director
        !            89: options to any user, group, or system.
        !            90: Type ``p'' (``permissions'') on the director options page
        !            91: to enter the access list editor.
        !            92: The system prompts for an option:
        !            93: ``m'' to modify an extant entry, ``d'' to delete
        !            94: an entry, ``i'' to insert a new entry, ``r'' to replot the list,
        !            95: ``q'' to quit editing the access list, and
        !            96: capital ``Q'' to quit editing the access list and IGNORE ANY CHANGES MADE.
        !            97: Delete or modify entries by entry number.  Scroll the entries using ``+'' and
        !            98: ``-''.
        !            99: 
        !           100:        After typing ``i'' to insert a new entry,
        !           101: the system prompts for a user type
        !           102: (``u'' for user, ``g'' for group, ``s'' for system).
        !           103: The system then prompts for the name of the user, group, or system.
        !           104: (Users and groups must be valid names)
        !           105: The default access options
        !           106: are then displayed: read, write, answer (for responses).  Use the keys
        !           107: ``r'', ``w'', ``a'', and ``d'' to toggle the read, write, answer, and director
        !           108: privileges respectively.  Some options automatically
        !           109: enable others (e.g., ``w'' for writing automatically enables ``a'' for answering).
        !           110: It is not possible to remove answer access while write access is enabled.
        !           111: The ``n'' key will remove all privileges (``no access'').
        !           112: Type return (or ``q'') when the correct options have been entered.
        !           113: The system prompts for another user.  Press return at the prompt to exercise
        !           114: other access list options.
        !           115: 
        !           116:        The access machinery checks user names before checking
        !           117: group names.
        !           118: If user ``john'' explicitly has no
        !           119: access but his group does, he will nevertheless be denied access to the file.
        !           120: If there is no explicit entry for user ``john'', a check is made for
        !           121: permissions granted to his group(s).
        !           122: (n.b.: an entry for user ``Other'' will match all users, 
        !           123: circumventing group permissions.
        !           124: The behavior typically desired can be achieved with a 
        !           125: group ``Other'' just as well.)
        !           126: 
        !           127:        If no explicit user entry exists, a search for group permissions
        !           128: is initiated.
        !           129: Users can belong to more than one group
        !           130: (although kernels such as Version 7 only allow one at a time)
        !           131: and the notesfile code checks each of the user's groups.
        !           132: If permissions for several of these groups exist,
        !           133: the user is given the inclusive OR of the several permissions.
        !           134: If none of the user's groups are given permission, a
        !           135: default permission specified by group ``Other'' is usually
        !           136: assigned.
        !           137: The ``Other'' entry matches when none of the other group entries
        !           138: have matched.
        !           139: This entry can be deleted, in which case no access is granted.
        !           140: 
        !           141:        The current implementation of system access
        !           142: enforcement is naive.
        !           143: The network software will send to a system only if it has read permission.
        !           144: Reception allows intermediaries
        !           145: to pass on notes even if they are not allowed write access to the notesfile;
        !           146: the access permission is determined from the originating system of each note
        !           147: or response
        !           148: instead of the site actually delivering the article.
        !           149: The name ``Other'' (capital ``O'') matches any system name not
        !           150: mentioned explicitly.
        !           151: 
        !           152:        Many notesfiles allow several users and groups to have
        !           153: read/write access,
        !           154: a single user to have director access
        !           155: (in addition to the notesfile ``owner''),
        !           156: and all other users no access.
        !           157: 
        !           158:        When a notesfile is first created, a default access 
        !           159: list is created.
        !           160: The notesfile ``owner'' is made director, group ``Other''
        !           161: and system ``Other'' are both given read/write access
        !           162: to the notesfile.
        !           163: If the file ``/usr/spool/notes/.utilities/access-template''
        !           164: exists, it contains a list of access-rights to add to
        !           165: the new notesfile's access list.
        !           166: The file contains lines of access-rights in the format used
        !           167: by the nfaccess program.
        !           168: Access-rights look like ``user:essick=drwa'';
        !           169: for more information on the format of these entries,
        !           170: see the man(I) page for nfaccess.
        !           171: 
        !           172: .ss "Policy Note"
        !           173: 
        !           174:        Type ``w'' (``write policy'') on the director option page to write a policy
        !           175: note (just like writing any other note).
        !           176: 
        !           177: .ss "Title & Director Messages"
        !           178: 
        !           179:        Change the notesfile title with ``t'', the director message with ``m''.
        !           180: The
        !           181: system prompts for a new message.
        !           182: Typing only a carriage return will not change the old message.
        !           183: 
        !           184: .ss "Open/Close"
        !           185: 
        !           186:        Type ``o'' (``open'') to toggle the availability of the notesfile (subject to
        !           187: the access list).
        !           188: Closed notesfiles are unavailable to non-directors.
        !           189: 
        !           190: .ss "Network Options"
        !           191: 
        !           192:        Type ``n'' (``network'') to toggle the availability of the notesfile
        !           193: for networking.
        !           194: Arrangements must be made with the notesfile system ``owner'' to do the network
        !           195: transfers.
        !           196: 
        !           197: .ss "Anonymous Notes"
        !           198: 
        !           199:        Type ``a'' (``anonymous'') to toggle the availability of
        !           200: anonymous notes in the notesfile.
        !           201: The availability of the anonymous option may provoke slanderous
        !           202: attacks from users
        !           203: (whose anonymity is completely protected).
        !           204: 
        !           205: .ss "Compression"
        !           206: 
        !           207:        Type ``c'' (``compress'') to compress the notesfile.  As notes
        !           208: are deleted, their text and index space is not reclaimed.  This command
        !           209: reclaims the space.  The notesfile must be closed.  On a VAX 11/780,
        !           210: 20 seconds of real time (on a slightly loaded system) is required to
        !           211: reclaim the space of a notesfile with 50 remaining notes
        !           212: (compression time is dependent on remaining notes).
        !           213: Notesfiles should be compressed whenever many of their notes have been
        !           214: deleted.
        !           215: The notesfile archiver ``nfarchive'' and cron(8) can be used to automate this
        !           216: process.
        !           217: 
        !           218:        The director's option page displays a count of ``holes''
        !           219: left by deleted notes and responses.
        !           220: This can be used as an indication of how much wasted space is within
        !           221: the notesfile.
        !           222: 
        !           223: .ss "Expiration Threshold"
        !           224: 
        !           225:        The `e' command allows a notesfile director to
        !           226: modify the notesfile's expiration threshold.
        !           227: Possible values include specific numbers of days, `default'
        !           228: and `never'.
        !           229: The value can be left unchanged by not specifying a 
        !           230: new value.
        !           231: The `default' value is assigned to new notesfiles;
        !           232: directors can change it as needed.
        !           233: 
        !           234:        The notesfile archiving program (nfarchive) examines the
        !           235: expiration threshold of each notesfile it processes.
        !           236: This threshold determines how long a note string must be inactive
        !           237: before it is eligible for archival.
        !           238: The `Default' expiration threshold uses the expiration time
        !           239: specified on the `nfarchive' command line; 
        !           240: this is usually 2 weeks.
        !           241: Specific ages can be specified.
        !           242: The age specified in the notesfile overrides the value 
        !           243: on the `nfarchive' command line.
        !           244: The `Never' threshold tells `nfarchive' that this notesfile is
        !           245: not to be archived.
        !           246: 
        !           247: .ss "Working Set Size"
        !           248: 
        !           249:        Each notesfile contains a working set of notes.
        !           250: The working set is the number of notes left in the notesfile
        !           251: by the nfarchive program.
        !           252: When nfarchive runs, it determines a maximum number of notes
        !           253: to delete.
        !           254: This number is the number of notes written in the notesfile
        !           255: minus the number of ``holes'' caused by deletions minus
        !           256: the working set size.
        !           257: Nfarchive will leave a ``working set size'' of notes in
        !           258: the notesfile;
        !           259: if fewer notes existed in the notesfile, no notes are
        !           260: archived.
        !           261: 
        !           262:        The working set size can be changed by the `s' command
        !           263: from the director page.
        !           264: Possible values include ``default'' and specific numbers.
        !           265: ``Default'' specifies that the value supplied during
        !           266: the nfarchive run is to be used;
        !           267: explicit values in the notesfile always override values
        !           268: specified on the nfarchive command line.
        !           269: 
        !           270: .ss "Expiration Action"
        !           271: 
        !           272:        Each notesfile can decide on the destination of expired 
        !           273: notestrings.
        !           274: The expiration action field takes one of the values
        !           275: ``Default'', ``Archive'' or ``Delete''.
        !           276: Archive and delete specify that expired notes are to be
        !           277: archived and deleted respectively.
        !           278: The default entry specifies that the expiration action should
        !           279: follow that specified on the nfarchive command line.
        !           280: 
        !           281: .ss "Expire With Director Message"
        !           282: 
        !           283:        Notesfiles can decide how to expire based on director
        !           284: message status individually.
        !           285: This option can assume four values:
        !           286: ``Default'',
        !           287: ``Nocare'',
        !           288: ``On'',
        !           289: and 
        !           290: ``Off''.
        !           291: The on and off values specify that only notes with the
        !           292: director message on or off respectively are eligible for
        !           293: expiration.
        !           294: The nocare value specifies that the director message status
        !           295: is not checked; both director and non-director marked notes
        !           296: are eligible for expiration.
        !           297: Select the default entry to use the value of this parameter
        !           298: as specified on the nfarchive command line.
        !           299: 
        !           300: .ss "Maximum Text per Article"
        !           301: 
        !           302:        The notesfile system imposes limits on the size of
        !           303: each article.  Earlier versions restricted articles to 64 kbytes;
        !           304: the current version provides for articles up to 4 Gigabytes.
        !           305: A constant is used to determine
        !           306: the actual maximum allowed per article.
        !           307: 
        !           308:        Each notesfile can select a maximum text length per
        !           309: article.
        !           310: This limit is not allowed to exceed the hard-coded limit
        !           311: (currently 3 Mbytes).
        !           312: Articles exceeding this limit are truncated and a message
        !           313: detailing the count of excess bytes and the system responsible
        !           314: for truncating the text is appended.
        !           315: 
        !           316:        Initially the maximum text length is set to the 
        !           317: highest permissible value.
        !           318: One reason for lowering the limit is to meet restrictions
        !           319: on the size of network transfers.
        !           320: 
        !           321: .ss "Deleting and Un-Deleting Many Articles"
        !           322: 
        !           323:        Type ``z'' (``zap'') to delete many notes (and their
        !           324: responses) quickly.
        !           325: Enter a list of note numbers or note ranges (aa-bb) separated by spaces.
        !           326: Confirm the command with ``y''; other responses will abort the command.
        !           327: It is economical and prudent to compress the notesfile
        !           328: shortly thereafter.
        !           329: Note that deleting notes in a networked notesfile makes those notes
        !           330: unavailable to those who poll your system for new notes and responses.
        !           331: 
        !           332:        The ``u'' (undelete) command performs the opposite function
        !           333: of the ``z'' command. 
        !           334: This command allows you to specify a list of note strings to
        !           335: be un-deleted.
        !           336: When prompted, the director shoul supply the note numbers he wishes
        !           337: to re-activate.
        !           338: The specified notes are re-activated and can be viewed as before.
        !           339: This command is only effective until a compression of the notesfile;
        !           340: after that time the notes are no longer present in the notesfile.
        !           341: 
        !           342: .ss "Director Options for Notes"
        !           343: 
        !           344:        Directors may put a ``director message'' above any note they write.
        !           345: There is one single line director message for each notesfile.  Typical
        !           346: director messages
        !           347: are: ``New Policy'', ``*** This problem fixed or ignored ***'',
        !           348: or ``-- Eat Flaming Death Fascist Pigs --''.
        !           349: Directors can also toggle the director message on
        !           350: a note being
        !           351: read (``d'' for ``director message'').
        !           352: A director can delete a note (and all its
        !           353: responses) or any response while reading the text of the note or response
        !           354: by typing ``Z'' (``zap this one'') and confirming with ``y''.
        !           355: 
        !           356: .ss "Default Sequencer Lists"
        !           357: 
        !           358:        Some users never set up an ``NFSEQ'' environment variable 
        !           359: specifying the notesfile they wish to see.
        !           360: The file ``/usr/spool/notes/.utilities/Dflt-Seq'' contains a 
        !           361: default list of notesfiles.
        !           362: Users without an ``NFSEQ'' variable receive the notesfiles listed
        !           363: in this file.
        !           364: The file can be changed at anytime and will take effect with
        !           365: the next ``autoseq'' by a user.
        !           366: 
        !           367: .se "Creation & Deletion of Notesfiles"
        !           368: 
        !           369:        Only the ``owner'' of the notesfile system can create notesfiles.
        !           370: Create notesfiles with the mknf command:
        !           371: 
        !           372:        mknf [ -aon ] topic1 [ ... ]
        !           373: 
        !           374:        The created notesfiles have default status of
        !           375: closed, non-networked, and
        !           376: no anonymous notes permitted.
        !           377: Specify -a to permit anonymous notes in the new notesfiles.
        !           378: Use -o to have the notesfiles marked open for general use and
        !           379: the -n option to enable the notesfiles' network availability.
        !           380: These status flags can all be modified from the directors page at later
        !           381: times.
        !           382: 
        !           383:        Delete notesfiles with rmnf:
        !           384: 
        !           385:        rmnf [ -f ] topic1 [ ... ]
        !           386: 
        !           387: Each notesfile to be removed must be verified with ``y'' after a
        !           388: prompt -- anything else will leave that notesfile intact.
        !           389: Use the -f option to blindly remove notesfiles;
        !           390: the verification step is bypassed when ``rmnf'' is invoked
        !           391: with the -f option.
        !           392: 
        !           393:        The file /usr/spool/notes/.utilities/avail.notes contains
        !           394: a list of the public notesfiles.
        !           395: The notesfile owner should update this file when he creates
        !           396: new notesfiles;
        !           397: this file is not automatically updated by ``mknf'' and ``rmnf''.
        !           398: The contents and format of the file are at the discretion of the
        !           399: notesfile system owner.
        !           400: 
        !           401: .se "Intersystem Notesfiles"
        !           402: 
        !           403:        The notesfile system provides for intersystem notesfiles
        !           404: in an arbitrary connected network.
        !           405: Copies of a shared notesfile must exist on each
        !           406: of the systems wishing to read notes for that notesfile.
        !           407: The contents are kept in synchrony through occasional exchanges
        !           408: over a network (UIUCDCS uses both uucp and tcp/ip).
        !           409: Notesfiles to be shared must have their ``network status'' enabled (see
        !           410: director options).
        !           411: 
        !           412:        Duplication of notes and responses is prevented by the use of
        !           413: unique identifiers.
        !           414: Each note and response in a notesfile is assigned a unique number.
        !           415: The networking software checks each note as it arrives to
        !           416: see if a copy already exists.
        !           417: In the event of duplication, the extra copy is discarded and
        !           418: the fact is logged in the statistics and the network log.
        !           419: 
        !           420:        In the (hopefully rare) event that a response arrives at a 
        !           421: system before the base note does, the network reception program will
        !           422: generate a ``foster parent'' for the orphaned response.
        !           423: When the true parent arrives,
        !           424: the foster parent will be overwritten.
        !           425: A count of orphaned responses received is kept and available 
        !           426: through use of the nfstats program (see section 4.4).
        !           427: 
        !           428: .ss "Transmitting Notesfile Updates"
        !           429: 
        !           430:        The nfxmit program gathers the new notes and responses in specified
        !           431: notesfiles and sends them to a specified site.
        !           432: The notesfile ``owner'' must occasionally enter the following command (or
        !           433: have it entered for him by cron)
        !           434: to update remote notesfiles with new notes and receive new remote
        !           435: notes:
        !           436: 
        !           437:        nfxmit -dsitename [-t datespec] [-r] [-a] [-f file] topic1 [...]
        !           438: 
        !           439: The ``sitename'' is the name of the remote site
        !           440: to receive the new notes.
        !           441: The remote site should have notesfiles matching those specified
        !           442: by the topic1 parameter.
        !           443: For remote notesfiles with different names, see the section below on
        !           444: Name Mapping.
        !           445: 
        !           446:        The optional -t specifies that all notes and responses
        !           447: since that date should be sent (normally -t is omitted and the notesfile
        !           448: system sends only new notes and responses).
        !           449: 
        !           450:        The -r option specifies that the remote notes system
        !           451: should not only receive the current changes but also reply in kind.
        !           452: This is useful if the remote system does not automatically run the
        !           453: nfxmit program.
        !           454: 
        !           455:        The -a option specifies that articles inserted
        !           456: from the news(I) system
        !           457: are to be sent also. Normally these articles are not sent because the 
        !           458: receiver probably has them; the primary use of this switch is for sites
        !           459: that do not run news(I).
        !           460: 
        !           461:        Using the -f switch tells nfxmit
        !           462: to read the file specified for a list
        !           463: of notesfiles to transmit;
        !           464: multiple -f parameters are permitted and can be freely intermixed
        !           465: with `topic' parameters.
        !           466: Notesfile name pattern matching is
        !           467: performed on both `topic' parameters and
        !           468: the entries in a file specified by the -f option.
        !           469: 
        !           470:        Nfxmit uses uux(1) as a transport and remote execution
        !           471: mechanism.  Connections using different protocols and mechanisms
        !           472: can be selected in the file ``/usr/spool/notes/.utilities/net.how'';
        !           473: its format is described in the section ``Non-Standard Links''.
        !           474: Uux typically permits a limited set of commands to be executed
        !           475: remotely.
        !           476: The file ``uuxqt.c'' in the UUCP source code contains a list of
        !           477: acceptable commands; this file should be edited to include the
        !           478: ``nfrcv'' program.
        !           479: 
        !           480: .ss "Network Transaction Log"
        !           481: 
        !           482:        The network software maintains a log of all transactions,
        !           483: including time, date, number of notes and responses transferred, direction
        !           484: of transfer,
        !           485: and number of notes replicated by transfer.
        !           486: This log is placed in a file called `net.log' and resides in the
        !           487: notesfile utility directory (by default: /usr/spool/notes/.utilities).
        !           488: 
        !           489:        This file will grow without bounds.
        !           490: Occasional pruning is a good idea.
        !           491: There is no vital information stored in this file;
        !           492: its purpose is to provide a network audit trail.
        !           493: 
        !           494: .ss "Non-Standard Links"
        !           495: 
        !           496:        Some systems will be unable to keep the notesfile network
        !           497: software in a public directory (such as /usr/bin).
        !           498: Other sites will have non-uucp links.
        !           499: The `net.how' file is for these cases.  `Net.how' is
        !           500: kept in the notesfile utility
        !           501: directory (/usr/spool/notes/.utilities)
        !           502: and 
        !           503: contains information on linking to remote systems.
        !           504: Entries in the file are made for systems with non-standard links
        !           505: and 
        !           506: have the following format:
        !           507: 
        !           508:        system:direction:protocol::command string
        !           509: 
        !           510:        The system field contains the name of the remote system.
        !           511: The direction field
        !           512: contains either an `x' or `r' (no quotes) and specifies the direction
        !           513: that the line is for. 
        !           514: An `x' specifies that the command string is for sending notes to the
        !           515: remote site; an `r' specifies that the command string is used in
        !           516: coercing the remote system to send its new notes and responses back.
        !           517: Lines beginning with a `#' are comment lines and ignored by the notesfile
        !           518: code.
        !           519: 
        !           520:        The protocol field is either empty or contains an integer
        !           521: value.  An empty field indicates protocol 0.
        !           522: Currently only protocols 0 and 1 are supported.
        !           523: The notesfile receiving programs automatically switch between
        !           524: protocols.
        !           525: 
        !           526:        The command string is a printf control string (without quotes)
        !           527: with two `%s'
        !           528: entries.
        !           529: The first is for filling in the name of the notesfile, the second is
        !           530: for the local system name.
        !           531: Many entries in the `net.how' file will be to place
        !           532: different paths on the `nfrcv' and `nfxmit' commands.
        !           533: The default command line is:
        !           534: 
        !           535:        uux -z - system\\!nfrcv %s %s
        !           536: 
        !           537: for the `x' entry and for the `r' entry:
        !           538: 
        !           539:        uux system\\!nfxmit %s -d%s
        !           540: 
        !           541: In the following sample from our net.how file, the host
        !           542: ``uicsovax'' is connected via UUCP and the notesfile networking
        !           543: programs live in non-standard directories.
        !           544: The host ``etherhost'' is reachable over a local network and the
        !           545: Berkeley ``rsh'' commands can be used to ship data between
        !           546: the local host and ``etherhost''.
        !           547: 
        !           548: .nf
        !           549:        uicsovax:x:::uux - uicsovax!/mnt/dcs/essick/.commands/nfrcv %s %s
        !           550:        uicsovax:r:::uux uicsovax!/mnt/dcs/essick/.commands/nfxmit %s -d%s
        !           551:        etherhost:x:::rsh etherhost /usr/bin/nfrcv %s %s
        !           552:        etherhost:r:::rsh etherhost /usr/bin/nfxmit %s -d%s
        !           553: .fi
        !           554: 
        !           555: 
        !           556: .ss "Notesfile Name Mapping"
        !           557: 
        !           558:        To provide flexibility in the naming of notesfile across systems,
        !           559: the network software looks in the
        !           560: directory /usr/spool/notes/.utilities/net.aliases
        !           561: for mappings of local notesfile names to remote notesfile names.
        !           562: Each file in the directory is named after a system (e.g., pur-ee or uicsovax).
        !           563: Each of these files contains lines which specify the mapping of local
        !           564: notesfiles to the particular systems notesfiles.
        !           565: Lines beginning with `#' in these files are comment lines and are ignored
        !           566: in the matching process.
        !           567: Data lines in the files look like:
        !           568: 
        !           569:        local_nf:remote_nf
        !           570: 
        !           571:        If there is no entry for a particular notesfile or
        !           572: the file for that system is missing, the local name is used.
        !           573: 
        !           574:        Mapping is performed by the transmission program ``nfxmit''.
        !           575: The ``nfrcv'' program does not consult this table.
        !           576: 

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