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Event correlation has become one of the most important techniques in today's network management, and there is a clear trend to extend its use to other application domains as well. Unfortunately, existing event correlation systems are often platform-dependent and heavyweight solutions that have complicated design, being therefore difficult to deploy and maintain, and requiring extensive user training. Their complexity and size makes them often unfeasible to apply for smaller networks and for smaller event correlation tasks. Also, some systems are cumbersome to use outside the domain of network fault management. In addition, commercial event correlation products tend to be quite expensive. In this paper the author presents a lightweight, open-source, and platform independent tool for rule-based event correlation called SEC (simple event correlator), and describes its application experience.