INT 2F - F-PROT v1.x only - F-DLOCK.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 = 4653h ('FS') CX = 0005h BX = subfunction 0000h installation check Return: AX = FFFFh 0001h uninstall Return: AX,BX,ES destroyed Program: F-DLOCK is part of the shareware F-PROT virusA program which attaches itself to other programs for the purpose of duplicating itself. Viruses often (but not always) contain harmful code which is triggered by some event, after a certain number of reproductions, or on a specific date. See also worm./trojan protection package by Fridrik Skulason SeeAlso: AX=4653h/CX=0004h,AX=CA00h Index: installation check;F-DLOCK|uninstall;F-DLOCK