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I am writing a small C# app to disable a device (my laptop touchpad) whenever another mouse device is detected, and enable the touchpad again if a mouse is not detected. I am not even able to disable the touchpad in device manager (it is running on the default mouse class driver). I am getting into device driver development so I thought maybe I could write a little filter driver that would just accept IOCTLs to enable and disable passing mouse event messages up the device stack, and get messages from user mode via a raw PDO. However, I asked that question and somebody has suggested that I can do this in usermode via the SetupDi.. functions. That would be really good, because this raw PDO communication method is a PITA to work with. I have only used SetupDiGetClassDevs before, and there are so many of them, can someone with more experience with this part of the Win32 API just tell me quickly what one I should call to stop/disable a mouse device or its interface or if there is something somewhere in the dark corners of the framework that will do this (maybe in WMI?). Update (24/9/09) I figured out how to do this with a filter driver and posted how I did it on my original question . I still want to know if it is possible to enable or disable devices directly from Win32 and if so, how - so I will leave this question open.

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