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[StefanRaepple]

Hello, I have a problem in understanding the middle-tier-server.
My question about that device is: Is that existing device physically or logical ?
And if it's physically, where can I find it on the client-side or on the server-side ?
What's the job of this device ?

In fact I've no idea about the middle-tier-server 

Thanks for any answer   Stefan Raepple 

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