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KRL is the language in which rulesets are programmed. Picos run KRL using the event evaulation evaluation cycle. Rules in KRL are "event-condition-action" rules because they tie together an event expression, a condition, and an action. Event expressions are how rules subscribe to specific events on the pico's event bus. KRL supports complex, declarative event expressions. KRL also supports persistent variables, which is how developers access the pico's state. KRL developers do not need a database to store attributes for the pico because of persistent variables.
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The pico engine is a host or container engine for picos. A given instance of the pico engine can host any number of picos. The pico engine makes picos work. Pico Engine is an open source project, hosted on GitHub.
KRL rulesets are usually hosted online. Developers register the URL with a pico engine to create a ruleset ID or RID. A given ruleset can be installed in any number of picos. When the pico runs, the engine gets the ruleset source, parses it, optimizes it, and executes it.
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