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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documentation, particularly for programming, you should not rely on the information found here, as it will be woefully out of date.

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BS_3STATE  Same as an auto-check box, except that the state of the box
alternates between selected, unselected, and halftone. The owner window
receives a WM_CONTROL message and changes the state of the three-state check
box when the user selects the box.
 
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