If the action is parameterized, you can pass parameters to it.    The biggest 
gotcha to be aware of is that the expression is evaluated when the action is 
invoked, which means local page state is not available.   If you are trying to 
select one entity out of a list, then you are better off with a request 
parameter.  I'd save the action parameters for when you want to pull related 
component state into an action.

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