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Monitoring USB ports

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Hi, Consider an application containing 4 text-boxes that receive input data from 4 identical keyboards plugged into 4 USB ports of a computer (each text-box receives data from one of the keyboards). How could I detect, using C or C++, from which USB port the data is coming? It is just to set the keyboard focus to the correct text-box. I'm considering the keyboards are not simultaneously used. Thanks in advance

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