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DUPLICATE: How can I programmatically determine if my workstation is locked?
How can I detect (during runtime) when a Windows user has locked their screen (Windows+L) and unlocked it again. I know I could globally track keyboard input, but is it possible to check such thing with environment variables?
You can get this notification via a WM_WTSSESSION_CHANGE message. You must notify Windows that you want to receive these messages via WTSRegisterSessionNotification and unregister with WTSUnRegisterSessionNotification.
These posts should be helpful for a C# implementation.
http://pinvoke.net/default.aspx/wtsapi32.WTSRegisterSessionNotification
http://blogs.msdn.com/shawnfa/archive/2005/05/17/418891.aspx
http://bytes.com/groups/net-c/276963-trapping-when-workstation-locked