Int 31 Fn 0503  P - DPMI 0.9+ - Resize Memory Block                        [E]

   AX = 0503h
   BX:CX = new size in bytes (nonzero)
   SI:DI = handle of memory block

Return: CF clear if successful
       BX:CX = new linear address
       SI:DI = new handle of memory block
   CF set on error
       AX = error code (DPMI 1.0+) (8012h-8014h,8016h,8021h,8023h)
       (see AX=0000h)

Notes: any selectors pointing at the block must be updated
   the previous memory block handle becomes invalid
   an error is returned if the new size is 0

See Also: AX=0102h,AX=0501h,AX=0505h