INT 21 - Phar Lap 386/DOS-Extender VMM v2.3+ - GET/SET VMM PARAMETERS

	AX = 252Eh
	CL = direction (00h get parameters, 01h set parameters)
	DS:EBX -> parameter buffer (see #01374)
Return: CF clear if successful
	CF set on error
	    EAX = error code (81h bad parameter value)