Through Display Properties, a user can change the background of the Windows Desktop, add a screensaver, change the overall color scheme and fonts of Windows, and adjust a computer's color depth and/or resolution (screen area). Not just a bunch of preference settings, display properties help individuals who have to deal with visual problems. In fact, children don't need to know the password used to access the Internet either. It may be a hassle to type it in each time they want to get online, but it's better to know the times that they connect than to have them sneak online without your permission and knowledge of their activities. The second step towards protecting your children online is using the computer together. What differentiates them from smartphones is that users can add (download and install) additional programs to smartphones and they seemingly become mini portable computers for the people who use them. That - and the ability to edit the content that sits on them - is what makes these phones "smart. That dot and group of three letters is known as an "extension," and the extension explains what kind of file it is. A file could be a plain text file, an image, a sound, a video, or program. But without seeing the extension, you wouldn't know it unless you double-clicked on it. The following list defines some of the most common extensions that you'll find on your computer. The buttons on these main menus of course take you to additional menus, which in turn give you even more choices to make. And all of those choices will eventually bring you to the service that you need. One very important choice you'll want to keep your eye on is the option to return to the main menu. The key is to understand what computer errors are, understand what they mean when they show up, and understand how to minimize their occurrence in the first place. Basically, computer errors are the result of a number of things that may or may not have anything to do with the way the computer is used.