INT 11 - RainbowFAX v1.3 - SFENGINE API(Application Program[ming] Interface) The defined set of calls which a program may make to interact with or request services of the operating system or environment under which it is running.  Because the inputs and outputs of the calls are well-defined, a program using the API can continue using the identical calls even if the internal organization of the program providing the API changes. - UNSUPPORTED FUNCTIONS
	AX = 7C03h-7CFFh
Return: AX = FFFFh
SeeAlso: AH=77h,AX=7C01h,AX=7C02h