Javascript code:function OnEvent_SignOut() { for (var oChatWnd = new Enumerator(Messenger.CurrentChats); !oChatWnd.atEnd(); oChatWnd.moveNext()) { Interop.Call('user32', 'SendMessageW', oChatWnd.item().Handle, 0x10 /*WM_CLOSE*/, 0, 0); } }