C# Definition:

[StructLayout(LayoutKind.Sequential)]
public struct WINDOWPLACEMENT
{
     public int length;
     public int flags;
     public int showCmd;
     public POINT ptMinPosition;
     public POINT ptMaxPosition;
     public RECT rcNormalPosition;
     public static WINDOWPLACEMENT Default
     {
      get
      {
           WINDOWPLACEMENT result = new WINDOWPLACEMENT();
           result.length = Marshal.SizeOf( result );
           return result;
      }
     }    
}

VB Definition:

<StructLayout(LayoutKind.Sequential)> _
Public Structure WINDOWPLACEMENT
     Public length As Integer
     Public flags As Integer
     Public showCmd As Integer
     Public minPosition As POINT
     Public maxPosition As POINT
     Public normalPosition As RECT
End Structure

User-Defined Field Types:

POINT, RECT

Notes:

Use with GetWindowPlacement and SetWindowPlacement