Connecting via named pipe from windows service (session#0) to desktop app (session #1)

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An easier solution might be to use a WCF duplex contract with the Windows service hosting the WCF service. The client App would call an operation on the service to register itself, when it starts up. The Ping would then be an operation invoked periodically by the service on the client’s callback contract, to which the App would respond.

Service visibility works this way round, because the Windows service can run with SeCreateGlobalPrivilege, and so the shared memory object via which the pipe name is published by the service can be created in the Global kernel namespace, visible to other sessions. Interactive applications can’t easily get that privilege in Windows7, so WCF services in such applications fall back to publishing the pipe in the Local kernel namespace, visible only within their own session.

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