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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.
A collection of picos interact using the Actor model by sending events to or making requests of other picos in the collection.
The Pico System
Picos exist in a system, called the "pico system." The following diagram shows the relationship and interactions between a pico and all the other members of the pico system.
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