How to know when a user console is locked or has logged "back into" windows

Posted by Paul Kohler on Stack Overflow See other posts from Stack Overflow or by Paul Kohler
Published on 2010-05-06T21:43:29Z Indexed on 2010/05/06 21:58 UTC
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This is in regards to applications that run in the taskbar but should be applicable to standard apps, Winforms, WPF, etc.

Question: I am after some method (preferably via managed code) to be notified when a user either has their screen "locked" while my app is running and/or know when they log back in.

GMail Notifier does this sort of thing for example, if my PC is locked for a while when I log in again it shows a list of emails that arrived since locking the PC. I'm looking to replicate that kind of functionality.

Does anyone have any ideas on how to accomplish this?

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