This presentation was extended and refined for a tutorial at Sigmod 2007 with the title Event Processing Using Database Technology.  Slides 78 and later of the Sigmod presentation map to the Dagstuhl presentation.  When reading the Sigmod presentation please use the presentation mode – some slide builds are important. I like to point especially to slides 92 and 155. Slide 92 (How Are Events and Messages Created?) discusses the controversy about the term event. I think it explains why there so divers views and why the view message = event has only limited application. Slide 155 (Challenges for Development Teams) intends to remind the research community that very innovative work is done by development teams; that researchers should become more aware of it and avoid competing with development teams as much as possible. A significant part of the contributions from the research community at the Dagstuhl seminar did not take this warning into account.