Format of XMS handle descriptor [array]:
Offset	Size	Description	)
 00h	BYTE	flag
		01h=free, 02h=used, 04h=in pool but not associated with any EMB
 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