Important Notice

The pages on this site contain documentation for very old MS-DOS software, purely for historical purposes. If you're looking for up-to-date documentation, particularly for programming, you should not rely on the information found here, as it will be woefully out of date.

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SB_PAGEUP  User clicked the scroll-bar background above the slider.
Decrement the slider position by the number of data units in the window and
scroll toward the top of the data by the same number of units.
 
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