ZEPHYR(1) General Commands Manual ZEPHYR(1)
zephyr - Zephyr Notification Service
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 authenti-
cated 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
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 HostMan-
ager 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 han-
dles 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.
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'
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).
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, pro-
vided that the above copyright notice appear in all copies and that both that copyright notice and this permission notice appear in sup-
porting 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.
MIT Project Athena July 1, 1988 ZEPHYR(1)