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<A NAME="overview"></A>
<H2>3.1 Concepts</H2>

<DL class="page-index">
  <DT><A href="#overview">Overview</A></DT>
  <DT><A href="#device_concepts">Device Concepts</A></DT>
  <DT><A href="#filter_concepts">Filter Concepts</A></DT>
  <DT><A href="#optional_behavior">Optional Behavior</A></DT>
  <DT><A href="#convenie