Network Web cameras that include a built-in Web server are no longer exclusively the playthings of the IT set. As more homes add Wi-Fi networks, these 'IP cams' are fast becoming handy add-on devices for average consumers. Often marketed as surveillance tools for home or office security, network Webcams are now being employed by early adopters for more personal matters, such as watching kids and monitoring pets. Here's how to quickly add a Wi-Fi Webcam to your existing network.