INT 67H 5100H: Resize EMS Handle

                                                     Compatibility: EMS 4.0+ 
 Expects: AX    5100H
          BX    desired new size, in 16K pages
          DX    EMM Handle (as obtained via INT 67H 4300H)
 Returns: AH    EMM status (0=successful)
    Info: Expands or shrinks the size of an EMS allocation.

          When increasing the size of the allocation, the data in the
          currently-allocated pages is retained.

          Resizing to 0 (CX=0000H) does NOT free up a handle; be sure to
          free the handle (via fn INT 67H 4500H) before terminating your

See Also: INT 67H: EMM Services
          Extended Memory Specification (XMS)
          Interrupts and BIOS Services