C# Definition:

/// <summary>
/// Contains information about the placement of a window on the screen.
/// </summary>
[Serializable]
[StructLayout(LayoutKind.Sequential)]
internal struct WINDOWPLACEMENT
{
     /// <summary>
     /// The length of the structure, in bytes. Before calling the GetWindowPlacement or SetWindowPlacement functions, set this member to sizeof(WINDOWPLACEMENT).
     /// <para>
     /// GetWindowPlacement and SetWindowPlacement fail if this member is not set correctly.
     /// </para>
     /// </summary>
     public int Length;

     /// <summary>
     /// Specifies flags that control the position of the minimized window and the method by which the window is restored.
     /// </summary>
     public int Flags;

     /// <summary>
     /// The current show state of the window.
     /// </summary>
     public ShowWindowCommand ShowCmd;

     /// <summary>
     /// The coordinates of the window's upper-left corner when the window is minimized.
     /// </summary>
     public POINT MinPosition;

     /// <summary>
     /// The coordinates of the window's upper-left corner when the window is maximized.
     /// </summary>
     public POINT MaxPosition;

     /// <summary>
     /// The window's coordinates when the window is in the restored position.
     /// </summary>
     public RECT NormalPosition;

     /// <summary>
     /// Gets the default (empty) value.
     /// </summary>
     public static WINDOWPLACEMENT Default
     {
         get
         {
             WINDOWPLACEMENT result = new WINDOWPLACEMENT();
             result.length = Marshal.SizeOf( result );
             return result;
         }
     }    
}

VB Definition:

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

User-Defined Types:

POINT, RECT, ShowWindowCommand

Notes:

Use with GetWindowPlacement and SetWindowPlacement