This chapter examines a group of new common controls that you can use for a broad range of purposes, from measuring intensity levels to scrolling through a list to changing a value. Let's say that you want to control the intensity of the light emitted by a computer-controlled light bulb. (You can stop by my house if you think this is far-fetched.) You could use a trackbar to set or vary the intensity of the light. Or let's say that your application needs to process a number of database files, and you want to let the user know how far it's gotten. You could use a progress bar to show this. In addition to trackbars and progress bars, Microsoft Windows 95 also supports two other general-purpose common controls: up-down and animation controls.