WCF命名管道安全性和多个用户会话？

I have setup a WPF application that is single instance using a Mutex, this allows for the application to run within each user account if you are using user switching. The application sets up a WCF named pipe so that I can communicate to the single instance from another process (i.e. when the second process runs before it terminates due to the Mutex).I have setup a WPF application that is single i