Actions in SF in ST - what is R action?

I am looking in to this document in help

Behavior of the action qualifiers for SFC elements

I cannot understand how do I pass R qualifier? For instance I have 2 actions in step, first is N and second is R.

1. Does the order affect how it works?
2. How action N will know that action R is true or false? Action R have to return something or simply exists?

The confusion is that if R have a priority over all other AQ, then if I add it, no other AG assigned to the same step will be executed. SO why? I could simply not to add any other actions to the step.

Or let me for a question differently.

If there a condition when step is active, and action with AQ R does not block other actions?

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