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</script><!--End Google Analytics code--></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">2.&nbsp;Concepts</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="ch01s02.html">Prev</a>&nbsp;</td><th width="60%" align="center">&nbsp;</th><td width="20%" align="right">&nbsp;<a accesskey="n" href="ch02s02.html">Next</a></td></tr></table><hr></div><div class="chapter" lang="en"><div class="titlepage"><div><div><h2 class="title"><a name="concepts"></a>2.&nbsp;Concepts</h2></div></div></div><p>This chapter introduces some basic concepts that will help you to use Virgo.</p><div class="section" lang="en"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="concepts.modular"></a>2.1&nbsp;Modular Runtimes and Applications</h2></div></div></div><p>
Virgo Tomcat Server, Virgo Jetty Server, and Virgo Kernel are Java runtimes each composed of
a collection of modules and supporting applications which are also composed of a
collection of modules.
Modules can be shared between applications and multiple versions of modules
can co-exist.
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