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  Name:     maxhandles() - number of handles allocated to program
  Usage:    <integer> = maxhandles()
  Params:   none
  Returns:  integer equal to the maximum number of handles available
            for opening by the program

 ---------------------------------- Example ---------------------------------

                 if maxhandles() < 55
                      ? "Not enough handles to run program"
                      ? "Set FILES=55 in your config.sys file"
                      quit
                 endif

  Note:     This function will return the number of handles set
            by the sethandles() function. The default setting is
            20 if no sethandles() are set. Note that DOS will take
            5 of these handles for itself.