IntPtr windowHandle = GetForegroundWindow();

    IntPtr windowHandle = GetForegroundWindow();

private static extern IntPtr GetForegroundWindow();

''' <summary>The GetForegroundWindow function returns a handle to the foreground window.</summary>

Private Shared Function GetForegroundWindow() As IntPtr

Private Declare Function GetForegroundWindow Lib "user32.dll" () As IntPtr

Public Declare Function GetForegroundWindow Lib "user32" () As Long

            IntPtr activeWindowHandle = Win32.GetForegroundWindow();

            //Optional Win32.GetWindowThreadProcessId(GetForegroundWindow(),out ProcessID)

IntPtr pID = GetWindowThreadProcessId(GetForegroundWindow(), IntPtr.Zero);

IntPtr pID = GetWindowThreadProcessId(GetForegroundWindow(), IntPtr.Zero);

    internal static extern IntPtr GetForegroundWindow();

        id = GetForegroundWindow();

    uint foreThread = GetWindowThreadProcessId(GetForegroundWindow(), IntPtr.Zero);

    if (GetForegroundWindow() != hWnd)

    Declare Function GetForegroundWindow Lib "user32" () As Int32

    Dim hWnd As Int32 = GetForegroundWindow()