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A small current is flowing through the light. In an insulated screwdriver with a neon tester, you put your thumb on the top and touch the other end on to the wire. It's best to make sure your other hand is behind your back and that you are not touching anything else. A live wire will light the neon. But if the neon does not light, that does not mean the wire is safe to touch. The power must be turned off back at the main switch before anything is touched.

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