msos2.hlp (Table of Contents; Topic list)
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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documentation, particularly for programming, you should not rely on the information found here, as it will be woefully out of date.
SB_SLIDERTRACK
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SB_SLIDERTRACK  User is dragging the slider. Applications that draw data
quickly can set the slider to the position given in the message and scroll
the data by the same number of units the slider has moved. Applications that
cannot draw data quickly should wait for the SB_SLIDERPOSITION code before
moving the slider and scrolling the data.
 
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