X10 systems work by sending signals to appliance-controlling modules over existing wiring in your house. You plug the controllers into the wall, and plug the lamps and appliances into the controllers. Then, you can activate the controllers either manually from a control keypad or automatically via your PC. The system controller stores directions you create using X10 software, so your PC doesn’t even have to be on for the system to work. You can but X10 controllers for about $13/module at your local Radio Shack, or buy complete systems that include a set of controllers, a control console, and software for your PC.

The best starter kits for families are X10 ActiveHome Deluxe Kit (800-675-3044, www.activehome.com; Windows CD, $99), IBM Home Director Universal Starting Kit (800-426-7235, www.pc.ibm.com/homedirector; $99), and, for the security-minded who have a few extra dollars to spare, the Honeywell PC Managed Home Security with TotalHome Control System (800-541-8001, www.honeywell.com; $599). Each comes with a limited number of modules to get you started and easy-to-configure software.