Detecting that the user is away from the PC with .NET

Question

I have a desktop application in which I would like to know two things:

1. Is the user currently on the PC (more specifically, is he giving any input to the PC), s

Answer 1

http://dataerror.blogspot.com/2005/02/detect-windows-idle-time.html

^ Detect Windows Idle Time. :)

The enabler for this feature is the GetLastInputInfo() Win32 API and the LASTINPUTINFO Win32 structure.