Int 31 Fn 0502  P - Dpmi 0.9+ - Free Memory Block                          [E]

   AX = 0502h
   SI:DI = handle of memory block

Return: CF clear if successful
   CF set on error
       AX = error code (DPMI 1.0+) (8023h) (see #2814)

Note:  any selectors allocated for the memory block must also be freed,
     preferably before freeing the memory block

See Also: AX=0001h,AX=0101h,AX=0501h,AX=0D01h