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 Summary -- Extend functions
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 _exmback()            Free allocated memory
 _exmgrab()            Allocate memory
 _parc()               Passes pointer to Clipper character string
 _parclen()            Length of character string
 _parcsiz()            Allocated size of a character string
 _pards()              Passes character pointer to Clipper date
 _parinfa()            Parameter type-checking of array elements
 _parinfo()            Parameter type checking
 _parl()               Passes Clipper logical as int
 _parnd()              Passes a Clipper numeric as double
 _parni()              Passes Clipper numeric as int
 _parnl()              Passes Clipper numeric as long
 _ret()                Return to Clipper
 _retc()               Pass a character string to Clipper
 _retclen()            Pass a character string and length 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
 _retnl()              Pass a long to a Clipper numeric