INT 7F U - Voyetra Multimedia Player - VMP.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 = 564Dh ('VMsee Virtual Machine') BH = C1h BL = function (00h-1Bh) 00h ??? Return: CF clear AX = 0000h ??? Return: AX = FFFFh if invalid function ??? SeeAlso: AX=4331h,AX=5658h