pinvoke.net: Edit: user32.GetDesktopWindow

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Summary: The GetDesktopWindow function returns a handle to the desktop window. The desktop window covers the entire screen. The desktop window is the area on top of which other windows are painted.

!!!!C# Signature:
 [DllImport("user32.dll", SetLastError = false)]
 static extern IntPtr GetDesktopWindow();

!!!!VB.NET Signature:
 <DllImport("user32.dll", SetLastError:=False)> _
 Private Shared Function GetDesktopWindow() As IntPtr
 End Function

!!!!VB Signature:
 Private Declare Auto Function GetDesktopWindow Lib "user32.dll" () As IntPtr

!!!!User-Defined Types:
None.
!!!!Notes:
None.

!!!!Tips & Tricks:
Please add some!

!!!!Sample Code:
Here are some functions that you can use to get an image of the destop:

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

Private Declare Auto Function GetWindowDC Lib "user32.dll" (ByVal windowHandle As IntPtr) As IntPtr

Private Declare Auto Function ReleaseDC Lib "user32.dll" (ByVal _
        windowHandle As IntPtr, ByVal dc As IntPtr) As Integer

Private Declare Auto Function BitBlt Lib "gdi32.dll" (ByVal _
        hdcDest As IntPtr, ByVal nXDest As Integer, ByVal _
        nYDest As Integer, ByVal nWidth As Integer, ByVal _
        nHeight As Integer, ByVal hdcSrc As IntPtr, ByVal nXSrc _
        As Integer, ByVal nYSrc As Integer, ByVal dwRop As _
        System.Int32) As Boolean

Private Const SRCCOPY As Integer = &HCC0020

Public Function GetScreenshot(ByVal windowHandle As IntPtr, _
        ByVal location As Point, ByVal size As Size) As Image

Dim myImage As Image = New Bitmap(size.Width, size.Height)
        Dim g As Graphics = Graphics.FromImage(myImage)

Dim destDeviceContext As IntPtr = g.GetHdc
        Dim srcDeviceContext As IntPtr = GetWindowDC(windowHandle)

BitBlt(destDeviceContext, 0, 0, size.Width, size.Height, _ 
               srcDeviceContext, location.X, location.Y, SRCCOPY)
        ReleaseDC(windowHandle, srcDeviceContext)

g.ReleaseHdc(destDeviceContext)
        g.Dispose

Return myImage
    End Function

'Alternately
    Public Function GetDesktopImage(ByVal loc As System.Drawing.Point, _
                                    ByVal area As System.Drawing.Size) _
                                    As System.Drawing.Image

Dim bmp As New Bitmap(area.Width, area.Height)
      Dim g As System.Drawing.Graphics = System.Drawing.Graphics.FromImage(bmp)
      Dim ptScr As System.Drawing.Point = Me.PointToScreen(loc)

g.CopyFromScreen(loc, New Point(0, 0), area, CopyPixelOperation.SourceCopy)

'housekeeping
      g.Dispose()

Return bmp
    End Function

!!!!Alternative Managed API:
Do you know one?  Please contribute it!

For Screenshots, you can use Graphics.CopyFromScreen

Documentation: GetDesktopWindow@msdn on MSDN