What Zephyr SUBSCRIPTIONS are (classes & instances)
A Zephyr subscription contains three pieces of information: Class, Instance,
Recipient. In order to receive a zephyr notice you must have a subscription
with the three fields matching that of the notice.
By default you are subscribed to the following:
<MESSAGE,PERSONAL,%ME%>
<OPERATIONS,MESSAGE,*>
The Class Field:
The is the major classification of the notice. The most common Class
is message. This is the class zwrite uses by default. Other classes
may have restrictions on who is allowed to send or subscribe to
notices.
The Instance field:
This field simply serves as a label to further classify the subject of
the class. If for example you had a class called 'food' , a possible
instance may be 'peanut-butter'. Generally, there are no restrictions
on who may receive or send notices by instance within a class. The
wildcard '*' may be used to indicate all instances within a class for
purposes of subscribing, but not sending.
The recipient field:
This field can be one of two things; a '*' or '%ME%'. %ME% is simply
an abbreviation for your username. When this field is set, the zephyr
message can only be received by that user. You cannot subscribe to
messages with recipient set to any other user but yourself.
A * indicates that the message was broadcast to many people. It serves
as wild card to show that the message was intended for no one in
particular.
To get or delete a subscription, use the zctl program. There is a man page on
zctl to which you should refer.
For other references, see the Zephyr on Athena document.
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