Forum posts for LogonUI.exe

How to tell that the logon screen is currently displayed?

I am writing a service application that will run with local system credentials. I will need to know from my service if the Windows logon screen is displayed at any particular time. Is there any way to do this?

PS. The screens that can be brought up by locking the workstation:



Or by trying to switch the user:



Or after a Ctrl+Alt+Del:



PS. I need this to run on Windows XP and up.

EDIT: The only viable solution that I came up with so far is to see if LogonUI.exe process is running. The issue with this approach is how to distinguish between the actual system logon process and any other process that has that image name?

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