A growing number of people have set up wireless networks in their homes.

While the systems make it possible for you to link more than one computer to the same high-speed Internet connection without cables, it also makes it possible for people who are nosy or who have criminal intentions to have access to your computers and the information you transmit, too.

The problem is that while Wi-Fi connections are easy to set up, that same ease of use makes it easy for people to have free access to your wireless connection.

The system can be hacked without you noticing or even used for criminal activity that would be traced to you, not the wrongdoer.

Experts suggest that you take the time to learn how to activate the security settings for wireless equipment -- even though such systems are often shipped with security provisions deactivated, so the devices can work out of the box.

Often, getting devices from different makers to work together requires entering 12-digit security codes on each device. The codes are made from letters and numbers, which can make them difficult to type correctly.

Wireless networks are also getting more popular as people use them to connect computers with other home electronics, such as stereo systems or televisions.

Learn: How Wi-Fi Works