An indicator notes the current setting. Some sliders allow users to alter the value of the slider by moving the indicator up and down.
Sliders can be analog or digital devices that display their values graphically.
Figure 7-13 shows an example of a slider. An example of a slider You can design and implement your own sliders as necessary for your application. When you design your sliders, be sure to include meaningful labels that indicate to users the range and direction of the slider. For instance, the Speaker Volume slider in the Sound control panel has numbers from 0 to 7 to indicate the loudness of the sound. It would be much clearer to users if the slider also had labels that stated the loudness in relative terms.