For scroll bar controls, this attribute determines the number of logical units by which the control's thumb (slider) moves in response to either pressing the corresponding arrow keys on the keyboard or by clicking the arrow buttons at either end of the scroll bar itself.

For slider controls, this attribute determines the number of logical units by which the control's thumb moves in response to pressing the corresponding arrow keys on the keyboard.

Inside a numeric scale limited by the values of the control's MIN and MAX attributes, the value of this attribute determines the size of the steps by which the thumb will be moved. If you set a small value in relation to the MIN and MAX attributes, the thumb will move continuously. If you set a larger value, the thumb will move in visible steps.

Applies to	Scrollbar control, slider control.
Data Type	I4
Default Value	0
Possible Values	0 or any integer value