The AScrollBar control is a very general control which can be adapted to a wide variety of purposes. It provides a scrollbar with beginning and ending arrows, a "thumb" which can be moved with the mouse or the keyboard, and a clickable background which will move the pointer by a predefined increment towards the end of the scrollbar to which the mouse is closest.
At first glance, the AScrollbar control does not appear to do very much. It simply provides a scrollbar that you can move back and forth. However, as the scrollbar is moved back and forth, it changes a numeric property called Value, and sends a notifying event each time. In the property pages of AScrollbar, you can set the numeric Minimum and Maximum values represented by the left and right sides of the scrollbar. You can also set the incremental value by which the scrollbar advances or retreats when it is moved to the left or right with the keyboard or mouse.
So, using the AScrollbar control, you can generate a range of values by moving the scrollbar back and forth which can be used to control other aspects of the ATEasy test environment. In the example above, the Value property of each scrollbar is shown in the respective ALabel control. Every time the scrollbar is moved, the value displayed changes to the numeric equivalent of the scrollbar's position. With a less-trivial example, you can cause any event to fire when the scrollbar is moved to a given position.