[FNAF 2] (Only Computer Compatible) - Use your mouse to look around (Vents are just for show) - Hold M for the cameras. They will reset when you close them. Click on a camera and continue to hold m to see what is there.
Pictures - FNAF Wiki - Just Cameras btw Note - The lights will dim on Cam 8 whenever there are animatronics. It will also drop a little bit down.