INT 2F U - HIMEM.SYS v3.09+ - GET XMS HANDLE TABLE
        AX = 4309h
Return: AL = 43h if function supported
            ES:BX -> XMS handle table (see below)
Note:   HIMEM.SYS v3.09 is part of MS-DOS 6.0.
SeeAlso: AX=4308h

Format of XMS handle table:
Offset  Size    Description
 00h    BYTE    ??? (01h in HIMEM.SYS v3.09)
 01h    BYTE    size of one handle??? (0Ah in HIMEM.SYS v3.09)
 02h    WORD    value of /numhandles= parameter (default = 20h)
 04h    DWORD   pointer to XMS handle array (see below)

Format of XMS handle [array]:
Offset  Size    Description
 00h    BYTE    flag 01h=free, 02h=used, 04h=unused
 01h    BYTE    lock count (00h=unlocked)
 02h    DWORD   address of XMS block in KB (shift left by 10 for abs. address)
 06h    DWORD   size of XMS block in KB

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