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IPC between Credential Provider and System Service

What is the best way to contact a user credential provider from a system service? Is it possible to send a message through a message pump? Can I use named pipes? Any suggestions would be appreciated.

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The credential provider starts in a user session, and the system service starts in a system session. As far as I know, this excludes Windows messages. Messages also require the creation of a window and a process with a message that is not normally served by the service.

I would suggest named pipes. The system service can create a channel and listen to it. Any instance of the credential provider is connected, and then a message is sent.

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