GFI LANguard System Integrity Monitor A utility that provides intrusion detection by checking whether files have been changed.

GFI LANguard System Integrity Monitor (S.I.M.) is a utility that provides intrusion detection by checking whether files have been changed, added or deleted on a Windows 2000/XP system. If this happens, it alerts the administrator by email. Because hackers need to change certain system files to gain access, this freeware utility provides a great means to identify any servers that are open to attack.