Programmatically Determine a Duration of a Locked Workstation?

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I hadn’t found this before, but from any application you can hookup a SessionSwitchEventHandler. Obviously your application will need to be running, but so long as it is:

Microsoft.Win32.SystemEvents.SessionSwitch += new Microsoft.Win32.SessionSwitchEventHandler(SystemEvents_SessionSwitch);

void SystemEvents_SessionSwitch(object sender, Microsoft.Win32.SessionSwitchEventArgs e)
{
    if (e.Reason == SessionSwitchReason.SessionLock)
    { 
        //I left my desk
    }
    else if (e.Reason == SessionSwitchReason.SessionUnlock)
    { 
        //I returned to my desk
    }
}

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