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As you can see in the URL for events and queries, channels are the way in which a pico can be identified by the pico-engine.
Picos A pico can have multiple channels. The best Best practice is to create a channel for each purpose or correspondent. This is because the main channel, created at the same time as the pico, should be kept secret because it cannot be replaced except by deleting the pico and re-creating a replacement pico. A channel that you create for a particular purpose can be revoked without affecting your pico.
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