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In this week, we start to explore the Contiki Os in detail. First we discuss about the Contiki system and its kernel architecture. Furthermore, we explore how loadable programs are actually implemented in Contiki. Second, we go through services and libraries in Contiki to see how they are built and when they can be invoked. Third, we discuss communication in Contiki via details of uIp and Rime communication stacks in Contiki. Next, prototheads are discussed to describe how application code is processed in Contiki. Furthermore, APIs of multi-threading is discussed. Last but not least, the Cooja simulator - a simulator for wireless sensor networks based on Contiki is introduced. All steps of installing and applying Cooja for a wireless sensor network applications are presented in detailed via an example application. Concretely, after attending this week, you will able to (1) describe how Contiki system and its kernel architecture are built. (2) Distinguish Contiki services and libraries in terms of how they are built, when they are invoked and why they are used. (3) Describe how communication is implemented and supported in Contiki and what protocols Contiki can support. (4) Explore how application's code is processed in Contiki and important functions of API for multithreading in Contiki (5) use Cooja for simulating wireless sensor networks applications.