Default Variables
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Default Variables are special variables that can not be overridden. You can use them just like any other variables.
$parent - a reference to a parent node;
$prevStep - a reference to the previous node within a node;
$nextStep - a reference to the next node within a node;
$dynamicVar - a object;
$response - a reference to a response in a node;
$env - an object.
$systemVar- an object for accessing system environment variables