C# Signature:

[DllImport("user32.dll")]
static extern IntPtr WindowFromPoint(POINT Point);

User-Defined Types:

POINT

Notes:

The WindowFromPoint function retrieves a handle to the window that contains the specified point.

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Sample Code:

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Alternative Managed API:

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http://msdn.microsoft.com/library/default.asp?url=/library/en-us/winui/winui/windowsuserinterface/windowing/windows/windowreference/windowfunctions/windowfrompoint.asp