I'm not entirely certain, but I think he's referring to the magic behavior of the <> operator when you don't give it a filehandle. This is not STDIN as such, but it's similarly magic (insofar as it allows reading from a filehandle without opening it first), and it makes a certain amount of sense in conjunction with what he was saying about arguments.
In reply to Re: Returning an error message when <STDIN> is not in use
by jonadab
in thread Returning an error message when <STDIN> is not in use
by chinamox
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