Way For Service To Detect When Logon Screen Is Present And When It's Gone?

May 25, 2010

I am planning on creating a service that measures the bootup time for a computer. It would go something like this:

1. Service starts and waits for CTRL+ALT+DEL screen
2. Timer starts when logon screen appears
3. User logs in and timer stops
4. Service waits for process X to start
5. Process X starts and service gets System.Environment.TickCount
6. Service subtracts step 3 ticks from tickcount

The reason for the logon screen timer is I don't want to measure if the user booted up and went for coffee or something and shows up 20 mins later to log in. Is there any way for the service to detect when the logon screen is present and when it's gone?

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