ior can easily be emulated with
  guards. The support of fork bars would make the implementation <b>much</b>
  more complex and they are only needed rarely.</p>

  <h4>Event dispatch to orthogonal regions</h4>

  <p>The Boost.Statechart event dispatch algorithm is different to the one
  specified in <a href=
  "http://www.wisdom.weizmann.ac.il/~dharel/SCANNED.PAPERS/Statecharts.pdf">David
  Harel's original paper</a> and in the <a href=
  "http://www.omg.org/cgi-bin/doc?formal/03-03-01">UML standard</a>. Bo