INT 67 - Virtual Control Program InterfaceA simple API for protected-mode programs to allocate memory and switch into or out of protected mode.  See also DOS Protected-Mode Interface. - GET NUMBER OF FREE 4K PAGES
	AX = DE03h
Return: AH = 00h  successful
	    EDX = number of free 4K pages
	AH nonzero: failed
Notes:	returns total number of pages available to ALL tasks in system
	also available in protected mode by calling the protected-mode VCPIsee Virtual Control Program Interface
	  entry point (see AX=DE01h,#03664)
SeeAlso: AX=DE04h