What do the LargeChange and SmallChange properties do for a ProgressBar control?

Question

I'm currently studying for the Microsoft.NET Framework 3.5 - Windows Presentation Foundation exam. In the book I have (by Matthew A Stoeckler) it says this about these properties:

LargeChange
  Represents the amount added to or subtracted from the Value property when a
  large change is required
SmallChange
  Represents the amount added to or subtracted from the Value property when a
  small change is required

I have no idea what it could mean for a progress bar.

Answer 1

LargeChange and SmallChange don't apply to ProgressBar - they are inherited from RangeBase and are used in ScrollBar.

They are used to determine (for the scrollbar at least) by how far to scroll if the user clicks the arrows at the end of the scroll bar (SmallChange) or the background of the ScrollBar either side of the slider (LargeChange)