document ZEPHYR_CLIENT variable.

diff --git a/doc/UsingZephyr b/doc/UsingZephyr
index 011f74d8a48415d585f16783dde41a564249058b..1f0cfe650fed5771b506fb2976643340663e5258 100644 (file)
--- a/doc/UsingZephyr
+++ b/doc/UsingZephyr
@@ -227,4 +227,20 @@ To reattach a screen session, possibly detaching from wherever it's currently at
 screen -dr
 }}}
 
-{{{screen}}} can do a whole lot more.   To find out about it, see UsingScreen.
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+{{{screen}}} can do a whole lot more.   To find out about it, see UsingScreen.
+
+== Interaction with Traditional Zephyr ==
+
+The default athena startup scripts launch zwgc on login. If you are subscribed to many classes and use Zephyr in today's contexts, zwgc's behavior is not very desirable. To disable zwgc startup, add:
+
+{{{
+setenv ZEPHYR_CLIENT false
+}}}
+
+to your {{{~/.environment}}} file if you use {{{tcsh}}} or
+
+{{{
+ZEPHYR_CLIENT=false
+}}}
+
+to your {{{~/.bash_environment}}} if you use {{{bash}}}. This will cause your shell to launch the {{{false}}} executable instead of zwgc which does nothing.
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