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See: https://sharplibhid.codeplex.com/SourceControl/latest#MainForm.cs

You could checkout the code and run that HID Demo if you wanted to set a few breakpoints to see how that works.

I'm the owner of that project.

You can only have one WM_INPUT registration per process I believe. So you need to hook into the WndProc from MP and call libhid.ProcessInput from there.

Then you should get events providing that you registered to OnHidEvent.