Use an adjustable keyboard tray to place a keyboard at the correct height. Position the mouse at keyboard level, close to the keyboard. You can use a wrist rest with a keyboard and mouse pad to ensure your wrists remain straight. Do not rest your hands on a wrist rest while typing or using the mouse.

Currently, passwords are required for individuals to gain access to computers and networks as well as to exchange e-mail messages and access certain Web sites. To prevent people from guessing a password, a password should be as long as possible, not appear in a dictionary, include symbols such as ?, % and #, should never be written down, should never be given to another person and should be frequently changed. Most people do not follow these guidelines and often forget their passwords. Since biometric traits cannot be forgotten or stolen, biometric technology can be more secure than passwords.

Biometric technology only allows the person with the identical biometric trait to gain access to a computer or device. If you want a colleague, friend or family member to be able to access your computer or device when you are in a different location, they will not be able to gain access. Also, if the biometric technology used by a computer or device malfunctions, you will not be able to gain access to the computer or device.

A mechanical mouse detects mouse movement using a ball on the bottom of the mouse which rolls as the mouse is moved. This type of mouse needs regular cleaning to remove dust and dirt from inside the mouse and ensure smooth motion. You should use a mouse pad to provide a smooth surface for moving the mouse and to reduce the amount of dirt that enters the mouse. An optical mouse detects mouse movement using a beam of light. This type of mouse does not contain any moving parts that can wear out or require cleaning. You do not need to use a mouse pad when using an optical mouse, but for best results you should use the mouse on a flat surface that is a solid color.

A tablet consists of a flat surface and a pen, called a stylus. When you move the Stylus on the surface of the tablet, the mouse pointer moves on the computer screen. Tablets are most often used for performing tasks that require speed and precision, such as graphic design and image editing. Tablets, also known as digitizer tablets and graphics tablets, also often come with a mouse that you can use in addition to the stylus.

A trackball is an upside-down mouse that remains stationary on your desk. You roll the ball with your fingers or palm to move the pointer on the screen. Trackballs usually include buttons that you can use the same way you use the buttons on a mouse. A trackball is a great alternative to a mouse when you have limited desk space.