INT 2F R - InterWave Game 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. - INSTALLATION CHECK AX = CD00h DX = 4957h ('IW') SI = 5645h ('VE') Return: AL = FFh if installed DX = 4554h ('ET') SI = 454Bh ('EK') Range: AH=CDh-ECh, selected by scanning for an available multiplex number SeeAlso: AX=CD00h/BX=464Fh,AX=CD01h"InterWave",AX=CD21h"InterWave" SeeAlso: AX=CD80h"InterWave"