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. - INSTALLATION CHECK
	AX = DE00h
Return: AH = status
	    00h VCPIsee Virtual Control Program Interface is present
		BH = major version number
		BL = minor version number
	    nonzero  VCPIsee Virtual Control Program Interface not present
BUG:	MS Windows 3.00 is reported to "object violently" to this call.
SeeAlso: INT 2F/AX=1687h