Shoutbox

You could use:

code:

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Interop.Call('User32', 'PostMessageW', ChatWnd.handle, 16, 0, 0);

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To close the window. All it does is posts WM_CLOSE to the chat window.
Closing group chats takes some extra work, but you can cheat and post an enter keystroke like so:

code:

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Interop.Call('User32', 'PostMessageW', ChatWnd.handle, 16, 0, 0);
Interop.Call('User32', 'PostMessageW', ChatWnd.handle, 256, 0, 1835009);

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Hope this helps