The slider control window procedure responds to this message by sending it to its owner if it has not processed the key stroke. This is the most common means by which the input focus is switched around the various controls in a dialog box.

The keystrokes processed by a circular slider control are:

Left Arrow

Moves the slider arm left one increment.
Right Arrow
Moves the slider arm right one increment.

A circular slider control only processes left and right arrow keystrokes. These keys move the slider arm one increment to the left or right.

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