TCP Server/Client Application

[wysota]

I cannot because the Viewer and the Driver are the different Client-objects:

Sorry, I don't understand. If you use protocol X between points A and B, why can't you use the same protocol between points B and C?

I don't really see the point of your thread here. Do you want us to invent some mystical hypothetical communication protocol between two (or more) unidentified, magical, hidden, maybe crouching, maybe shy, maybe legendary entities? If you have a specific question then ask it. If you have a specific problem, then describe it and then say what kind of help you expect. If you have an unidentified problem, identify it first.