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documentation, particularly for programming, you should not rely on the information found here, as it will be woefully out of date.

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WM_ACTIVATE         Indicates a change in activation state
WM_FOCUSCHANGE      Indicates that the focus window is changing
WM_QUERYFOCUSCHAIN  Queries the focus chain
WM_SETFOCUS         Indicates a change of focus
WM_SETSELECTION     Indicates whether a window is selected/deselected