INT 18 - SPHINX C-- - WB.COM - 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.
	AX = 5350h ('SP')
	BX = 4849h ('HI')
	CX = 4E58h ('NX')
	DH = function
	    01h set ???
		DL = ???
	    02h get ???
		Return: DL = ???
	    03h get ???
		Return: ES:DI -> ??? data buffer
	    06h ???
Return: AX = 7370h ('sp') if installed
	BX = 6869h ('hi') if installed
	CX = 6E78h ('nx') if installed
Program: SPHINX C-- is a shareware compiler by Peter Cellik for a language
	  which is a cross between C and assembler; WB.COM is the driver which
	  launches the WorkBench