msgs12.hlp (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documentation, particularly for programming, you should not rely on the information found here, as it will be woefully out of date.
Focus and activation messages (1.2)
Message Groups  Overview                          Up Next Previous
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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