Format of DPMI shared memory allocation request structure:
Offset	Size	Description	)
 00h	DWORD	requested length of shared memory block in bytes
 04h	DWORD	(ret) allocated length of block
 08h	DWORD	(ret) shared memory handle
 0Ch	DWORD	(ret) linear address of memory block
 10h	PWORD	selector:offset32 of ASCIZ name for memory block
		(name max 128 bytes)
 16h  2 BYTEs	reserved
 18h  4 BYTEs	reserved (00h)