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 __PARC                Pass pointer to Clipper character string
 __PARCLEN             Return length of character string
 __PARCSIZ             Return allocated size of a character string
 __PARDS               Pass character pointer to Clipper date
 __PARINFA             Parameter type-checking of array elements
 __PARINFO             Parameter type-checking
 __PARL                Pass Clipper logical as int
 __PARND               Pass Clipper numeric as double
 __PARNI               Pass numeric as int
 __PARNL               Pass Clipper numeric as long
 __RET                 Return to Clipper
 __RETC                Pass a character string to Clipper
 __RETCLEN             Passes character string back to Clipper
 __RETDS               Pass a date string to a Clipper date
 __RETL                Pass an int to a Clipper logical
 __RETND               Pass a double to a Clipper numeric
 __RETNI               Pass an int to a Clipper numeric