Credits
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  The Professional Calculator for Clipper (tm) was written and produced
  by Jim Gale of Touchstone Business Creations.

  The CALC and all included functions are written entirely in Clipper 5.x;
  however, one additional function has been added to the CALC.LIB taken
  from the public domain library called NANFOR.LIB.  The function is
  FT_NUMLOCK() which allows CALC to get/set the status of the numlock.
  This is written in C and was added to CALC.LIB under the same name to
  prevent function duplication for developers who use NANFOR.LIB.

  Thanks to Ted Means for his donation of FT_NUMLOCK() to NANFOR.LIB and
  to Glenn Scott for the production of NANFOR.LIB.

  Also, special thanks to the current users of CALC that have sent in
  their requests for desired abilities.