<html><head><META http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>Chapter&nbsp;2.&nbsp;Concepts</title><meta content="DocBook XSL Stylesheets V1.76.0" name="generator"><link rel="home" href="index.html" title="Virgo User Guide"><link rel="up" href="index.html" title="Virgo User Guide"><link rel="prev" href="ch01s03.html" title="A Note for Virgo Nano Users"><link rel="next" href="ch02s02.html" title="OSGi Concepts"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table summary="Navigation header" width="100%"><tr><td align="left" width="20%"><a accesskey="p" href="ch01s03.html">Prev</a>&nbsp;</td><th align="center" width="60%">&nbsp;</th><td align="right" width="20%">&nbsp;<a accesskey="n" href="ch02s02.html">Next</a></td></tr></table><hr></div><div class="chapter" title="Chapter&nbsp;2.&nbsp;Concepts"><div class="titlepage"><div><div><h2 class="title"><a name="concepts"></a>Chapter&nbsp;2.&nbsp;Concepts</h2></div></div></div><div class="toc"><p><b>Table of Contents</b></p><dl><dt><span class="section"><a href="ch02.html#concepts.modular">Modular Runtimes and Applications</a></span></dt><dt><span class="section"><a href="ch02s02.html">OSGi Concepts</a></span></dt><dd><dl><dt><span class="section"><a href="ch02s02.html#N100B2">Bundles</a></span></dt><dt><span class="section"><a href="ch02s02.html#N10111">Life Cycle</a></span></dt><dt><span class="section"><a href="ch02s02.html#concepts.services">Services</a></span></dt><dt><span class="section"><a href="ch02s02.html#N10184">Versioning</a></span></dt></dl></dd><dt><span class="section"><a href="ch02s03.html">Spring DM and Blueprint Concepts</a></span></dt><dt><span class="section"><a href="ch02s04.html">Virgo Concepts</a></span></dt><dd><dl><dt><span class="section"><a href="ch02s04.html#concepts.repositories">The Provisioning Repository</a></span></dt></dl></dd><dt><span class="section"><a href="ch02s05.html">p2 Concepts</a></span></dt></dl></div><p>This chapter introduces some basic concepts that will help you to use Virgo.</p><div class="section" title="Modular Runtimes and Applications"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="concepts.modular"></a>Modular Runtimes and Applications</h2></div></div></div><p>
	Virgo Server for Apache Tomcat, Virgo Jetty Server, Virgo Kernel and Virgo Nano 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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