Hello, there are many cases where it is useful to monitor a system in real-time and trace the sequence of events. This link http://sinelabore.com/doku.php?id=wiki:toolbox:trace-the-event-flow explains how to do code instrumentation and create nice looking Sequence Diagrams showing exactly the flow of events (trace) for a detailed analysis. For the graphics rendering Mscgen is used. Best regards, Peter --- www.sinelabore.com