TCP Server/Client Application

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

void Server::incomingConnection(int socketDescriptor) {
    Client *client = new Client(this);
    client->setSocket(socketDescriptor);
}

void Server::incomingConnection(int socketDescriptor) {
    Client *client = new Client(this);
    client->setSocket(socketDescriptor);
}

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How to get the data from the Client-Driver for the Client-Viewer?