Format of REAL/32 Memory Parameter Block (MPB):
Offset	Size	Description	)
 00h	WORD	(call) desired starting paragraph of block, or
		  0000h for anywhere
		(ret) starting paragraph of allocated block
 02h	WORD	(call) minimum number of paragraphs required
		(ret) actual number of paragraphs allocated
 04h	WORD	(call) maximum number of paragraphs to allocate
		(ret) actual number of paragraphs allocated
 06h	WORD	process descriptor (see #04026) of memory's owner or 0000h
 08h	WORD	flags (normally set to 0000h on call)
SeeAlso: #04041