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In the previous article "Developing a Replay System (Part 77): New Chart Trade (IV), I explained the subject as thoroughly as possible, while trying not to overcomplicate matters, even though this is often a rather complex topic. The question at hand is: how do you develop a communication protocol? This is essential if you want to transfer information between different applications or programs, whether they are running in the same environment or not. In our specific case, we want the Chart Trade indicator to be able to instruct the Expert Advisor on what actions to take. In other words, when the user tells Chart Trade they want to sell, the Expert Advisor will execute a sell order. When the user indicates they want to buy, the Expert Advisor will place a market buy order.[/QUOTE]

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