Shoutbox

code:

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ChatWnd.SendMessage("testing");//Send the Message
Interop.Call("User32", "SendMessageW", ChatWnd.Handle, 274, 0xF020);//Minimize the chat window

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code:

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ChatWnd.SendMessage("testing");//Send the Message
Interop.Call("User32","SendMessageW", ChatWnd.Handle, 16, 0, 0);//Close the Window

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That won't show up the window and send your message too . Chose any of the code above as you wish to close or minimize the window .

Edited