INT 60 U - Agfa TTSR.EXE - 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 = 899Bh
	BX = function
	    0001h installation check
		Return: BX = 899Bh if installed
	    0002h ???
	    0003h ???
	???
Return: ???
Note:	TTSR.EXE is found in FotoLook 2.09 (16-bit), which is available from
	  agfa.com; it appears to provide DOS ASPI support
!!!