94 lines
3.8 KiB
Groff
94 lines
3.8 KiB
Groff
.\" $Id$
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.\"
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.\" Copyright 1987,1988 by the Massachusetts Institute of Technology
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.\" All rights reserved. The file /usr/include/zephyr/mit-copyright.h
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.\" specifies the terms and conditions for redistribution.
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.\"
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.TH ZEPHYR 1 "July 1, 1988" "MIT Project Athena"
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.ds ]W MIT Project Athena
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.SH NAME
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zephyr \- Zephyr Notification Service
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.SH DESCRIPTION
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.PP
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Zephyr is a notice transport and delivery system developed at MIT
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which runs under 4.3BSD Unix.
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.PP
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A Notice Transport and Delivery system is a method of getting small
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quantities of time sensitive information efficiently from one client
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(or server) on a network to another. The object is to accomplish this
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with the highest possible fan-out (i.e., client to server ratio) while
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maintaining both network and server performance. Zephyr is a
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multi-cast notice transport and delivery system based upon an
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authenticated datagram protocol. Localized Zephyr servers provide
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routing, queueing and dispatching services to clients which
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communicate with them via the Zephyr Client Library. Two special
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purpose Zephyr clients, the WindowGram client and the HostManager
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client provide user and client host communication support.
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.PP
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.I Zephyrd(8)
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servers run on designated server machines. These servers maintain a
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database of subscriptions and locations for every user using Zephyr.
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The servers stay in contact with one another, and provide a reliable
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backup system (via duplication) in the event of network failures.
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.PP
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Each client machine on the network runs a
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.I zhm(8)
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HostManager client program which is the link between the Zephyr
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servers and the users. User programs send notices to the HostManager,
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and the HostManager forwards these notices to the nearest server for
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action. The HostManager is responsible for ensuring that the notices
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reach a server, and for finding a new one if its server fails to respond.
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.PP
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Each user on the network usually runs a WindowGram client program
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automatically upon login.
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.I Zwgc(1)
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displays notices to the user, and handles user
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responses. Only notices to which the user has subscribed will be sent
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to the WindowGram client.
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.PP
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Subscriptions are handled through the
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.I zctl(1)
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program. This program allows the user to add or delete subscriptions
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from Zephyr, to add the subscriptions to a file, and to perform other
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miscellaneous functions.
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.SH SEE ALSO
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kerberosintro(1)
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.br
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zaway(1), zctl(1), zleave(1), zlocate(1), znol(1), zwgc(1),
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zwrite(1), zmailnotify(1)
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.br
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zhm(8), zephyrd(8), zinit(8), zstat(8), zpopnotify(8),
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zshutdown_notify(8), syslogd(8)
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.br
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Project Athena Technical Plan Section E.4.1, `Zephyr Notification
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Service'
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.SH AUTHORS
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.PP
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.br
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Tony Della Fera (MIT-Project Athena, DEC),
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Mark W. Eichin (MIT-Project Athena),
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Robert S. French (MIT-Project Athena),
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David C. Jedlinsky (MIT-Project Athena),
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John T. Kohl (MIT-Project Athena, DEC),
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William E. Sommerfeld (MIT-Project Athena).
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.SH RESTRICTIONS
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Copyright (c) 1987,1988,1989 by the Massachusetts Institute of Technology.
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All Rights Reserved.
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.br
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Permission to use, copy, modify, and distribute this software and its
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documentation for any purpose and without fee is hereby granted,
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provided that the above copyright notice appear in all copies and that
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both that copyright notice and this permission notice appear in
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supporting documentation, and that the name of the Massachusetts
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Institute of Technology not be used in advertising or publicity
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pertaining to distribution of the software without specific, written
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prior permission.
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.br
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M.I.T. DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
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ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL
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M.I.T. BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR
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ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
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WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
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ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
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SOFTWARE.
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