Putting one's computer on lockdown isn't a bad idea, and this handy little application can help users do just that. Essentially, the application sets off an alarm if someone attempts to use your Mac, and prevents the system from being muted or put to sleep. Users can also customize its detection feature by activating the computer's motion or keyboard sensors. This version is compatible with computers running Mac OS X 10.5. This archived version of the software is provided by CNet.