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My laptop's got a mysterious extra button on it that doesn't cause any keyboard messages -- I've verified this with a low-level keyboard hook.

It appears that it's an "ACPI Fixed Feature Button". Any ideas how I'd go about responding when it's pressed? I found some discussion of how it works in kernel mode. Does this information percolate up to user mode? Or do I have to write a filter driver?

Win32 or .NET solutions accepted. Windows Vista.

A: 

Following URLs may be of interest to you. Vista ACPI Driver document and Vista ACPI Driver PPT

lakshmanaraj