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\section{General Concepts}
\label{general-concepts}

The following pages describe two concepts that may be useful to an
applications programmer: The {\em subscription\/} paradigm for notice
distribution and the {\em user location\/} system.  The subscription
paradigm is used to determine who will receive a given notice.  The
user location system is used to locate users.

\input{subscriptions}
\input{locator}
