WM_PACTIVATE - Parameters

usactive (USHORT)

Active indicator.

TRUE

The window was activated
FALSE
The window was deactivated.

hwnd (HWND)

Window handle.

In the case of activation, hwnd identifies the window which was activated. In the case of deactivation, hwnd identifies the window which was deactivated.

ulReserved (ULONG)

Reserved value, should be 0.

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