iSpazz is a plugin for iTunes on OS X, controlling the MacBook Pro/PowerBook backlight keyboard and optionally the display backlight.
To use this yourself, download the plugin, uncompress it and copy it to Library/iTunes/iTunes Plug-ins in your home folder.
Pressing the “i” key toggles the display flicker. Use at your own risk....
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Problems downloading? Read our
downloading guide 
Support for iSpazz is available from the
publisher/developer site 
This download (iSpazz) is freeware. "Freeware is copyrighted computer software which is made available for use free of charge, for an unlimited time, as opposed to shareware where the user is required to pay (e.g. after some trial period or for additional functionality)." More info at
Wikipedia.
Soft32 (ITNT) cannot be held liable for issues that arise from the download or use of these software products. We encourage you to determine whether this software or your intended use is legal. Even if we try to check the program files for viruses, we cannot guarantee 100% that they are clean. For your own protection always check downloaded files for viruses, spyware and malware.