XMS 0bH: Move Extended Memory Block

                                                     Compatibility: XMS 2.0+ 
 Expects: AH    0bH
          DS:SI address of a filled-in XmsMoveInfoRec (see below)
 Returns: AX    status: 0000H = successful
                        0001H = error and BL=XMS error code (if BL >= 80H)
    Info: This fn copies a block of data from one location to another.  Use
          it to transfer data into and out of extended memory.  It can also
          copy data from place to place in conventional memory or between
          extended memory blocks.

    DS:SI points to a structure that describes the data to be moved.  It is
          formatted as:

           Offset Size Contents
           ▀▀▀▀▀▀ ▀▀▀▀ ▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀
            +0      4  lRgnLength   DWORD size, in bytes to move
                                     (must be an even number)
            +4      2  wSrcHandle   src XMB handle or 0=conventional mem
            +6      4  lSrcOffset   DWORD offset in src XMB block
                                     or segment:offset in conventional mem
           +0aH     2  wDestHandle  dest XMB handle or 0=conventional mem
           +0cH     4  lDestOffset  DWORD offset in dest XMB block
                                      or segment:offset in conventional mem
                    16              size of an XmsMoveInfoRec

          When wSrcHandle or wDestHandle is 0000H, the source or
          destination is in conventional memory.  In that case, the
          lSrcOffset (or lDestOffset) must be a 32-bit segment:offset in
          conventional memory.

   Notes: ■ If source and destination overlap, the source must be less than
            the destination.

          ■ The lRgnLength must be even.

          ■ The move is faster when both source and destination begin on
            WORD boundaries and faster still when aligned on DWORD
            boundaries (on 386+ CPUs).

See Also: XMS Functions
          Extended Memory Specification (XMS)
          DOS Functions