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NAME

       zephyr - Zephyr Notification Service

DESCRIPTION

       Zephyr is a notice transport and delivery system developed at MIT which
       runs under 4.3BSD Unix.

       A Notice Transport and Delivery system is a  method  of  getting  small
       quantities  of  time  sensitive information efficiently from one client
       (or server) on a network to another.  The object is to accomplish  this
       with  the highest possible fan-out (i.e., client to server ratio) while
       maintaining both network and server performance.  Zephyr  is  a  multi-
       cast  notice  transport and delivery system based upon an authenticated
       datagram protocol.  Localized Zephyr servers provide routing,  queueing
       and dispatching services to clients which communicate with them via the
       Zephyr  Client  Library.   Two  special  purpose  Zephyr  clients,  the
       WindowGram  client  and  the HostManager client provide user and client
       host communication support.

       Zephyrd(8) servers run on designated server  machines.   These  servers
       maintain a database of subscriptions and locations for every user using
       Zephyr.  The servers stay in contact with one another,  and  provide  a
       reliable  backup  system  (via  duplication)  in  the  event of network
       failures.

       Each client machine on the network runs  a  zhm(8)  HostManager  client
       program  which  is  the  link between the Zephyr servers and the users.
       User programs send notices to  the  HostManager,  and  the  HostManager
       forwards   these  notices  to  the  nearest  server  for  action.   The
       HostManager is responsible  for  ensuring  that  the  notices  reach  a
       server, and for finding a new one if its server fails to respond.

       Each  user  on  the  network  usually  runs a WindowGram client program
       automatically upon login.  Zwgc(1) displays notices to  the  user,  and
       handles  user responses.  Only notices to which the user has subscribed
       will be sent to the WindowGram client.

       Subscriptions are handled through the zctl(1)  program.   This  program
       allows  the user to add or delete subscriptions from Zephyr, to add the
       subscriptions to a file, and to perform other miscellaneous functions.

SEE ALSO

       kerberosintro(1)
       zaway(1), zctl(1), zleave(1), zlocate(1), znol(1), zwgc(1),  zwrite(1),
       zmailnotify(1)
       zhm(8),     zephyrd(8),     zinit(8),     zstat(8),      zpopnotify(8),
       zshutdown_notify(8), syslogd(8)
       Project Athena  Technical  Plan  Section  E.4.1,  `Zephyr  Notification
       Service'

AUTHORS

       Tony  Della Fera (MIT-Project Athena, DEC), Mark W. Eichin (MIT-Project
       Athena), Robert S. French  (MIT-Project  Athena),  David  C.  Jedlinsky
       (MIT-Project  Athena),  John T. Kohl (MIT-Project Athena, DEC), William
       E. Sommerfeld (MIT-Project Athena).

RESTRICTIONS

       Copyright  (c)  1987,1988,1989  by  the  Massachusetts   Institute   of
       Technology.  All Rights Reserved.
       Permission  to  use, copy, modify, and distribute this software and its
       documentation for any  purpose  and  without  fee  is  hereby  granted,
       provided  that the above copyright notice appear in all copies and that
       both that  copyright  notice  and  this  permission  notice  appear  in
       supporting  documentation,  and  that  the  name  of  the Massachusetts
       Institute of  Technology  not  be  used  in  advertising  or  publicity
       pertaining  to  distribution  of the software without specific, written
       prior permission.
       M.I.T. DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
       ALL  IMPLIED  WARRANTIES  OF  MERCHANTABILITY  AND FITNESS, IN NO EVENT
       SHALL M.I.T. BE LIABLE  FOR  ANY  SPECIAL,  INDIRECT  OR  CONSEQUENTIAL
       DAMAGES  OR  ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
       PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
       ACTION,  ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF
       THIS SOFTWARE.



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