Get/set handle name

        Entry:
          AH = 53h
          AL = subfunction
                00h get handle name
                    ES:DI = pointer to 8-byte handle name array
                01h set handle name
                    DS:SI = pointer to 8-byte handle name
          DX = handle
        Return:
          AH = status
            00h successful
            80h internal error
            81h hardware malfunction
            83h invalid handle
            84h undefined function requested
            8Fh undefined subfunction
            A1h duplicate handle name