How can I determine which taskbar application/windows are requesting user attention

I'd like to know how to get a list of the windows requiring u开发者_JAVA技巧ser attention from the Windows taskbar. Windows requiring attention appear with a flashing orange color within the Windows taskbar.

Un-focused MSN Messenger conversation windows are a good example of this behavior: they turn orange as soon as a remote user sends an instance message.

My code targets the Windows 7 platform, but working on older Windows OS would be nice too.

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I believe HSHELL_FLASH you get notified about by calling RegisterShellHookWindow is what you are after.