http://www.vogella.de/articles/EclipseRCPHelpSystem/article.html
http://wiki.event-b.org/index.php/Providing_help_for_your_plug-in_(How_to_extend_Rodin_Tutorial)
http://www.eclipse.org/articles/Article-Online%20Help%20for%202_0/help1.htm
http://www.eclipse.org/articles/article.php?file=Article-AddingHelpToRCP/index.html
http://dollyn.iteye.com/blog/150896
http://www.ibm.com/developerworks/cn/linux/opensource/os-echelp/