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CPNMouse allows developers to use more than one pointing device in Windows 2000/XP applications, while maintaining backward compability with old applications.
At http://klafbang.dk/personlig/publications.php3, you can find the article Supporting Multiple Pointing Devices in Microsoft Windows, which describes the device driver and corresponding APIs. When looking at the automatically generated API documentation, you should pay particular attention to hapi.h and (to a lesser extent) lapi.h.
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