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C# Framework for WinCC OA Open Architecture connectivity (XMLRPC)
...The proxy also acts as a distributor - if clients have the same dp(Query)Connects,
the connects are done once, and the proxy will forward it to the clients.
Easy example for a dpQueryConnect with a delegate:
client.DpQueryConnectSingle((object s, ArrayList a) => {
Console.WriteLine("event!);
}, "SELECT '_online.._value', '_online.._stime' FROM '*.**'");