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- persistent: They exist from when they are created until they are explicitly deleted. Picos retain state based on past operations.
- unique: They have an identity that is immutable. While attributes of the pico, its state, may change, its identity does not.
- online: They are available on the Internet and respond to events and queries.
- concurrent: They operate independently of one another and process events and queries asynchronously.
- event-driven: They respond to events by changing state and sending new events.
- rule-based: Their behavior is expressed as rules that pattern-match against incoming events.
A collection of picos interact by sending events to or making requests of other picos in the collection in an Actor-like manner.
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