INT 67H 4b00H: Count Handle's Pages

                                                     Compatibility: EMS 3.2+ 
 Expects: AX    4b00H
          DX    EMM Handle (as obtained via INT 67H 4300H)
          ──────────────────────────────────────────────────────────────────
 Returns: AH    EMM status (0=successful)
          ──────────────────────────────────────────────────────────────────
    Info: Returns number of EMS pages owned by a handle.

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