One of the most important issues in creating effective KRL rulesets is remembering information from one user interaction to the next.
KRL declarations cannot cause side effects. That doesn't mean KRL rule sets can't cause persistent changes that are available from one rule-set execution to another. KRL has persistent variables that can be used inside any expression in a rule set and can be changed in the postlude.
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The power of persistent variables--especially entity variables--should not be understated. Entity variables allow developers to cerate multi-tenanted application without ever having to manage user identity. The system automatically tracks user sessions and ensures that the user's data is available to the ruleset on demand.