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                                 dos_free

   Usage
   include <dos.h>
   int dos_free(unsigned);

   Description
   Frees  (releases  back  to MSDOS) memory  which  has  been  previously
   allocated  with dos_alloc or dos_calloc. The argument is  the  segment
   address of the memory to be freed.

   Example
   See the example for dos_alloc.

   Return Value
   0 if the memory was sucessfully freed, otherwise -1.