Insufficient memory will cause errors as well. That's why software programs include minimum memory requirements. A program that needs 14MB of memory will generate errors on a computer that only has 4MB of memory if it runs at all. The same goes for disk space, monitor color depth and resolution. In these situations, problems occur the moment that a piece of software attempts to access the things (hardware, memory, space, resolution, etc. We often joke around the office about the "grandma" who refuses to use a computer until she can afford the "latest" one. Chances are, Grandma isn't ever going to shell out the bucks to buy the latest computer on the market, nor is she going to know how to use it once she gets it. What Grandma doesn't realize however is that a used computer is an excellent training tool that she can use to prepare herself for something "better" in the future. If you think about it, there's no reason why a five, seven, or even twelve year old needs to know the passwords to sensitive areas on the computer unless you've given them permission! 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. Check box - a check box is a small box that allows a user to indicate several choices among many. When clicked, a small "x" displays inside a box. Similar to the check box, a radio button allows a user to indicate a single choice among many. Problems with radio buttons and check boxes occur when a user makes one choice, but the interface reacts as if the user made many choices (or none at all). If you want to use a computer to help with a career in multimedia however, you're going to need to accessorize your system with a scanner, printer, digital camera, tablet, or digicam for example. If you want a computer to help with a career in music, you will need a quality microphone and set of speakers. In the latter case, don't be surprised if you find the entire Microsoft Office suite displayed within a screen no bigger than a matchbook. Is this a phase? That's highly doubtful. The market for these devices extends from the highly technical and professional all the way to the pre-teen socialite. The product crosses all demographics and thanks to decreasing costs - it sees no economic boundaries as well.