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. - FREE 4K PAGE
	AX = DE05h
	EDX = physical address of 4K page
Return: AH = status
	    00h successful
	    nonzero failed
Note:	also available in protected mode by calling the protected-mode VCPIsee Virtual Control Program Interface
	  entry point (see AX=DE01h,#03664)
SeeAlso: AH=3Fh,AX=DE04h