diff --git a/Pilz.Win32/Native/POINT.vb b/Pilz.Win32/Native/POINT.vb
new file mode 100644
index 0000000..e967331
--- /dev/null
+++ b/Pilz.Win32/Native/POINT.vb
@@ -0,0 +1,21 @@
+Imports System.Runtime.InteropServices
+
+Namespace Native
+
+    <StructLayout(LayoutKind.Sequential)>
+    Public Structure POINT
+        Public Sub New(ByVal p As System.Drawing.Point)
+            Me.x = p.X
+            Me.y = p.Y
+        End Sub
+
+        Public Sub New(ByVal x As Integer, ByVal y As Integer)
+            Me.x = x
+            Me.y = y
+        End Sub
+
+        Public x As Integer
+        Public y As Integer
+    End Structure
+
+End Namespace
diff --git a/Pilz.Win32/Native/RECT.vb b/Pilz.Win32/Native/RECT.vb
new file mode 100644
index 0000000..650ecba
--- /dev/null
+++ b/Pilz.Win32/Native/RECT.vb
@@ -0,0 +1,82 @@
+Imports System.Drawing
+Imports System.Runtime.InteropServices
+
+Namespace Native
+
+    <Serializable, StructLayout(LayoutKind.Sequential)>
+    Public Structure RECT
+        Public Left As Integer
+        Public Top As Integer
+        Public Right As Integer
+        Public Bottom As Integer
+
+        Public Sub New(ByVal left_ As Integer, ByVal top_ As Integer, ByVal right_ As Integer, ByVal bottom_ As Integer)
+            Left = left_
+            Top = top_
+            Right = right_
+            Bottom = bottom_
+        End Sub
+
+        Public Sub New(ByVal r As Rectangle)
+            Left = r.Left
+            Top = r.Top
+            Right = r.Right
+            Bottom = r.Bottom
+        End Sub
+
+        Public ReadOnly Property Height As Integer
+            Get
+                Return Bottom - Top
+            End Get
+        End Property
+
+        Public ReadOnly Property Width As Integer
+            Get
+                Return Right - Left
+            End Get
+        End Property
+
+        Public ReadOnly Property Size As System.Drawing.Size
+            Get
+                Return New System.Drawing.Size(Width, Height)
+            End Get
+        End Property
+
+        Public ReadOnly Property Location As System.Drawing.Point
+            Get
+                Return New System.Drawing.Point(Left, Top)
+            End Get
+        End Property
+
+        Public Function ToRectangle() As Rectangle
+            Return Rectangle.FromLTRB(Left, Top, Right, Bottom)
+        End Function
+
+        Public Shared Function FromRectangle(ByVal rectangle As Rectangle) As RECT
+            Return New RECT(rectangle.Left, rectangle.Top, rectangle.Right, rectangle.Bottom)
+        End Function
+
+        Public Overrides Function GetHashCode() As Integer
+            Return Left ^ ((Top << 13) Or (Top >> &H13)) _
+                ^ ((Width << &H1A) Or (Width >> 6)) _
+                ^ ((Height << 7) Or (Height >> &H19))
+        End Function
+
+        Public Shared Function FromXYWH(ByVal x As Integer, ByVal y As Integer, ByVal width As Integer, ByVal height As Integer) As RECT
+            Return New RECT(x, y, x + width, y + height)
+        End Function
+
+        Public Shared Widening Operator CType(ByVal rect As RECT) As Rectangle
+            Return Rectangle.FromLTRB(rect.Left, rect.Top, rect.Right, rect.Bottom)
+        End Operator
+
+        Public Shared Widening Operator CType(ByVal rect As Rectangle) As RECT
+            Return New RECT(rect.Left, rect.Top, rect.Right, rect.Bottom)
+        End Operator
+
+        Public Overrides Function ToString() As String
+            Return "Left=" & Me.Left & ", Top=" & Me.Top & ", Right=" & Me.Right & ", Bottom=" & Me.Bottom
+        End Function
+    End Structure
+
+End Namespace
diff --git a/Pilz.Win32/Native/User32.vb b/Pilz.Win32/Native/User32.vb
new file mode 100644
index 0000000..d10c083
--- /dev/null
+++ b/Pilz.Win32/Native/User32.vb
@@ -0,0 +1,17 @@
+Imports System.Runtime.InteropServices
+
+Namespace Native
+
+    Public Class User32
+
+        <DllImport("user32")>
+        Public Shared Function GetWindowRect(ByVal hWnd As IntPtr, ByRef r As RECT) As Boolean
+        End Function
+
+        <DllImport("user32.dll")>
+        Public Shared Function ChildWindowFromPointEx(ByVal hWndParent As IntPtr, ByVal pt As POINT, ByVal uFlags As UInteger) As IntPtr
+        End Function
+
+    End Class
+
+End Namespace
diff --git a/Pilz.Win32/Native/WindowFromPointFlags.vb b/Pilz.Win32/Native/WindowFromPointFlags.vb
new file mode 100644
index 0000000..e127c8c
--- /dev/null
+++ b/Pilz.Win32/Native/WindowFromPointFlags.vb
@@ -0,0 +1,11 @@
+Namespace Native
+
+    <Flags>
+    Public Enum WindowFromPointFlags
+        CWP_ALL = &H0
+        CWP_SKIPINVISIBLE = &H1
+        CWP_SKIPDISABLED = &H2
+        CWP_SKIPTRANSPARENT = &H4
+    End Enum
+
+End Namespace
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