Display Message while shutdown

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C++

Windows

I have my application which got upgraded while system is shutting down.
All the upgradation is performed by a service.

I want to display a message to user while system is shutting down That "Application is upgrading please wait."

How can i show this message on windows shutdown screen.
Please keep in mind that user session is already being logged off.


I didn't find any references doing this programatically.
I can get shut down event in service but not able to show the message.

Thanks

[edit]removed bold tags. rjm[/edit]