While it's possible that I'm seriously misunderstanding the issue, I do believe that it's completely unnecessary to catch the logout event because Windows already has this hook built-in. See this technet explanation. The links on that page offer more details.

In other words, your script will only be triggered on this event so there will never be a need to look for it -- it'll only run when appropriate.

In reply to Re^3: Catching system events, via WMI by igelkott
in thread Catching system events, via WMI by freebsdboy

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