=== Classes and Instances ===
+Generall the most interesting discussion on Zephyr, however, happens on so-called Zephyr ''classes''. A class is a bit like a chat room in other IM systems. Anyone can send a zephyr to a class, and anyone who is subscribed to that class will receive it. There is no security on classes -- anyone who knows the name of a class can subscribe, and there is no way to determine who is subscribed to a given class.
+
+To subscribe to a class, use the subscribe command:
+
+{{{:subscribe CLASSNAME * *}}}
+
+To send a zephyr to a class, use the zwrite command with the -c option:
+
+{{{:zwrite -c CLASSNAME}}}
+
+Zephyrs to classes usually have an instance attached. An instance is a short \93topic\94 or \93subject\94 that indicates the context of a zephyr. Different instances are often used to multiplex multiple conversations on a high-traffic class. You can specify an instance with the -i option to zwrite:
+
+{{{:zwrite -c CLASSNAME -i INSTANCE}}}
+
+A message without an instance specified will default to the instance \93personal\94.
+
=== Colors ===
=== Filters ===
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