Purpose: Handles the game's Chat dialog. Methods: static void Open (CWnd *pParent) - Opens the modal dialog. static void Close() - Close the dialog. void OnCancel () - Cancel message handler. void AddMessage(DPID idFrom, DWORD dwTankID, LPCSTR szMsg) - Add a new message to chat list box. void PostNcDestroy( ) - Gracefully shutdown the dialog.