Persistent Compute Objects, or picos, are tools for modeling the Internet of Things. A pico represents an entity–something that has a unique identity and a long-lived existence. Picos can represent people, places, things, organizations, and even ideas. 

...

Once the response has been returned, the pico waits for another event.

KRL

KRL Rulesets execute inside a persistent compute object, or pico. 

While rulesets are the primary organizing feature of KRL, you cannot program KRL without understanding picos. 

Event Binding

Persistent Data Variables

Rulesets

CloudOS

Applications

...