Simply open a Windows program that uses a camera, you should be able to select the iSight or external camera for use with the program.To use a built-in iSight or external camera with Windows: If your Mac or display has a built-in iSight camera, or if you connect a compatible external webcam, by default you can use it with Windows. Use the Built-in iSight Camera or Another Webcam Use the Built-in iSight Camera or Another Webcam