INT 31H 0502H: Free Memory Block

                                                    Compatibility: DPMI 0.9+ 
 Expects: AX    0502H
          SI:DI handle of memory block to free
 Returns: CF    NC (clear) if successful; else AX = DPMI Error Code
    Info: Frees a block of memory that was previously allocated via
          INT 31H 0501H or INT 31H 0504H.

          No descriptors are freed by this call.  It is the client's
          responsibility to free descriptors that map this memory.  You
          should free descriptors before freeing the memory.  See
          INT 31H 0001H (free LDT descriptors).

See Also: DPMI API
          INT 2fH: Multiplex Interrupt
          DOS Functions