Guard is an OS X application that protects your Mac by keeping an eye on the currently logged in users. Even though Mac OS X is already protected from most threats, iGuard adds an extra layer of security and will protect you from hackers that could gain remote access to your Mac.
Logged in users. iGuard lets you see which users are currently logged into your Mac.
Log out anyone. With iGuard, you can force any user to log out.
ActiveProtect. iGuard will notify you whenever someone logs into your Mac or whenever someone logs out.
Mac OS X 10.6