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<TITLE>AliRoot description</TITLE>
+<!-- Changed by: , 1-Nov-1999 -->
<link rev="made" href="mailto:Federico.Carminati@cern.ch">
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<TD><img src="picts/MadHatter.gif" alt="ALICE Off-line Project Logo">
-<TD><img src="picts/alidesc_name.gif" alt="AliRoot description">
+<TD><img src="picts/manual_name.gif" alt="AliRoot description">
<TD><img src="picts/AliceLogo.gif" alt="ALICE Logo">
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-<h2>Overview of AliRoot</h2>
+<font size=+2 color=red><blink>This part is under construction.</blink>
+</font>
+<H2><A NAME="#Content">Content</A></H2>
-<p> Under construction
+<UL>
+<LI><A HREF="#General">General AliRoot architecture</A></LI>
+<LI><A HREF="#Virtual">Virtual MonteCarlo schema</A></LI>
+<LI><A HREF="#AliRoot">AliRoot flow of control</A></LI>
+</UL>
+
+<HR>
+
+<h2><A HREF="#Content" NAME="General">General AliRoot architecture</A></h2>
+
+<p> This picure is a general schema of the AliRoot architecture.
+
+<center><img src="picts/architecture.gif" height=500></center>
+
+<p> The following picture shows an high-level decomposition of AliRoot
+into functional blocks.
+
+<center><img src="picts/aliroot_schema.gif" height=400></center>
+
+<h2><A HREF="#Content" NAME="Virtual">Virtual MonteCarlo schema</A></h2>
+
+<p> This picture illustrates the concept of Virtual MonteCarlo schema
+as it is implemented by AliRoot.
+
+<center><img src="picts/virtualmc.gif" height=500></center>
+
+<p> This picture illustrates the stepping action mechanism for the virtual
+MC. Only the GEANT 3 version is operational, while the GEANT 4
+one is under testing.
+
+<center><img src="picts/virtualmc2.gif" height=300></center>
+
+<h2><A HREF="#Content" NAME="AliRoot">AliRoot flow of control</A></h2>
+
+<p> This picture illustrates the AliRoot flow of control.
+
+<center><img src="picts/alirootflow.gif" height=300></center>
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