Format of Global EMM Import record:
Offset	Size	Description	)
 00h	BYTE	bit flags
		bit 2: ???
		bit 3: free EMM386 virtual HMA only if hma_page_table_paddr!=0
		bit 4: no UMB???
 01h	BYTE	reserved (0)
 02h	WORD	size of structure in bytes
 04h	WORD	structure version
 06h	DWORD	reserved
 0Ah 384 BYTEs	64 EMS frame status records (see #01516), one per 16K of
		  real-mode 1M address space
18Ah	BYTE	??? (must be at least 3*number_of_EMS_frames+4)
18Bh	BYTE	number of UMB frame descriptors following
18Ch 4N DWORDs	UMB frame descriptors
		each is 4 DWORDs giving physical page numbers for the four
		  4K pages of a 16K EMS frame (00000000h if non-UMB page)
var	BYTE	number of EMS handle info records following
    16N BYTEs	EMS handle info records (see #01518)
---version 1.10+ ---
	DWORD	realmode INT 67 vector (used by Windows to set breakpoints)
	DWORD	physical address of HMA page table values
	BYTE	number of free page entries following
     2N DWORDs	free page entries
		each is:
		    DWORD	physical page number
		    DWORD	number of consecutive physical pages
	BYTE	number of XMS handle info records following
		00h if memory manager does not emulate XMS or has real mode
		  XMS code which can execute in the Windows environment
    12N BYTEs	XMS handle info records (see #01519)
	BYTE	number of free UMB info records following
     2N WORDs	free UMB info records
		each is:
		    WORD	real mode start segment
		    WORD	size in paragraphs
---version 1.11---
     20 BYTEs	blank-padded maker name
     20 BYTEs	blank-padded product name