HELPLIB.HLB  —  Lexicals  F$IDENTIFIER  Return Value
    An integer value if you are converting an identifier from a name
    to an integer. The F$IDENTIFIER function returns a string if
    you are converting an identifier from an integer to a name. If
    you specify an identifier that is not valid, the F$IDENTIFIER
    function returns a null string ("")  (if you are converting from
    number to name) or a zero (if you are converting from name to
    number).
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