The second button, on the right, usually provides some less-frequently needed capability. For example, when viewing a Web page, you can click on an image to get a popup menu that, among other things, lets you save the image on your hard disk. Some mouses have a third button for additional capabilities. Some mouse manufacturers also provide a version for left-handed people. In some systems, the user can also choose among several different cursor appearances.
Some people use a mousepad to improve traction for the mouse ball.
Although the mouse has become a familiar part of the personal computer, its design continues to evolve and there continue to be other approaches to pointing or positioning on a display. Users of graphic design and CAD applications can use a stylus and a specially-sensitive pad to draw as well as move the cursor. Other display screen-positioning ideas include a video camera that tracks the user's eye movement and places the cursor accordingly. Hunter Digital has a NoHands Mouse that lets you place the cursor by using a foot pedal. If you're still getting used to using a mouse, Lawrence Goetz has a Web page where you can practice using your mouse .