Cats and computers don't mix. Any cat owner will tell you kitties like to walk, jump or sprawl on keyboards in just such a way as to uninstall software or even crash your computer. "For some cats, keyboards are like New Age sandals with rubber nubs pointing upwards onto their soles. Shiatsu for cats, maybe," says computer programmer Chris Niswander, inventor of PawSense, a program that can sense when a cat depresses multiple keys. One or two paw steps are enough for the software to block access to computer and emit anticat sounds -- a variety of annoying noises performed by Niswander. You can also record your own message such as "Bad kitty!"

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