C# Constants:

public const int WA_INACTIVE = 0;
public const int WA_ACTIVE = 1;
public const int WA_CLICKACTIVE = 2;

VB Constants:

TODO

Notes:

public bool PreFilterMessage(ref Message m)
{
     if (m.Msg == Win32.WM_ACTIVATE && m.HWnd == f.Handle
     && Win32.LoWord(m.WParam.ToInt32()) == WA_INACTIVE) {
     ...
     }
}

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