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RLIB Error Codes

   All RLIB functions are designed to handle runtime errors with as much
   grace as possible.  When a runtime error occurs, the programmer has a
   choice of trapping these errors or letting the error crash your
   program.  RLIB functions use the former method.

   The most frequent errors that occur when calling Clipper functions are
   parameter omission and/or type mismatches.  Most of the RLIB functions
   test for the proper number of parameters and for the proper parameter
   types.  If a required parameter is omitted or if a parameter type is
   mismatched, and the function cannot rely on a default value, the
   function will simply return.  If the function returns a value that is
   indicative of success, the return value in such a case will be the
   failure value.

   As do all Clipper functions, every RLIB function must return some
   value.  Additionally, as with functions in Clipper and C, RLIB
   functions may return ONLY ONE VALUE.