The VSKYLABS C-47 is featuring sliding cockpit side-windows. To slide open or close, simply point and click on either one of the side windows handles. Opening the windows will let the external sounds to get into the cockpit.
The cockpit side windows are also effective for cockpit ventilation in case of cockpit smoke (due to fire or any other reason). When smoke gets into the cockpit, open the side windows for ventilation and smoke elimination.