One example that jumps to mind are fruit machines (as known in the UK; perhaps one-armed bandits elsewhere. I'm referring to the modern ones rather than the older and simpler ones). They often have little 'diversions' (nudge buttons, or paths to jackpots) outside of the normal path that are not always available. They indicate availability by light, often flashing when trying to attract attention to themselves (and give reward to the user) and work as an example of availability indicated by light.
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