+<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>