msos2.hlp (Table of Contents; Topic list)
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WC_SCROLLBAR
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WC_SCROLLBAR  Creates a scroll bar. A scroll bar is a rectangular window
containing a slider and direction arrows at both ends. The scroll bar sends
a notification message to its parent window whenever the user clicks the
mouse in it or uses the ARROW keys to scroll the contents of the window. The
parent updates the position of the slider, if necessary. You can position
scroll bars anywhere in a window and use them whenever you need to provide
scrolling input for a window. Scroll-bar styles