A wireless network allows you to roam around your clinic with your laptop computer, free from cables and wall jacks, and still have access to your practice data and applications. However, freedom has a price. Like instant networks, wireless networks don't require a hub but instead rely on NICs to break up data and transmit them to the appropriate receiving computer. However, because there's no hub to monitor and control traffic, the network tends to slow down with each added computer. In addition, unlike with a cordless telephone, with wireless networks there's typically no audio feedback during data transfer, and it's sometimes hard to know when you're out of range.
Transfer problems can result from low batteries, receiver failure, or a physical obstruction.
I've had good results with Proxim's Symphony wireless network. It's very useful as long as all your computers are less than 150 ft away from each other. Even so, wireless networks may be worth the price. They are freeing and, with the exception of a diminutive 6-in. For example, an issue that most small-office network systems do not adequately address is security.