pinvoke.net: Edit: coredll.FindWindowW

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Summary: The function retrieves the handle to the top-level window whose class name and window name match the specified strings. This function does not search child windows.

!!!!C# Signature:
 [DllImport("coredll.dll", EntryPoint="FindWindowW", SetLastError=true)]
 private static extern IntPtr FindWindowCE(string lpClassName, string lpWindowName);
!!!!VB Signature:
 Public Declare Function FindWindow Lib "Coredll" Alias "FindWindowW" (ByVal lpClassName As String, ByVal lpWindowName As String) As IntPtr

!!!!User-Defined Types:
!!!!C# Signature:
        public const int SWP_ASYNCWINDOWPOS = 0x4000;
        public const int SWP_DEFERERASE = 0x2000;
        public const int SWP_DRAWFRAME = 0x0020;
        public const int SWP_FRAMECHANGED = 0x0020;
        public const int SWP_HIDEWINDOW = 0x0080;
        public const int SWP_NOACTIVATE = 0x0010;
        public const int SWP_NOCOPYBITS = 0x0100;
        public const int SWP_NOMOVE = 0x0002;
        public const int SWP_NOOWNERZORDER = 0x0200;
        public const int SWP_NOREDRAW = 0x0008;
        public const int SWP_NOREPOSITION = 0x0200;
        public const int SWP_NOSENDCHANGING = 0x0400;
        public const int SWP_NOSIZE = 0x0001;
        public const int SWP_NOZORDER = 0x0004;
        public const int SWP_SHOWWINDOW = 0x0040;

public const int HWND_TOP = 0;
        public const int HWND_BOTTOM = 1;
        public const int HWND_TOPMOST = -1;
        public const int HWND_NOTOPMOST = -2;

!!!!VB.Net Signature:
	Public Const SWP_NOSIZE As Integer = &H1
	Public Const SWP_NOMOVE As Integer = &H2
	Public Const SWP_NOZORDER As Integer = &H4
	Public Const SWP_NOREDRAW As Integer = &H8
	Public Const SWP_NOACTIVATE As Integer = &H10
	Public Const SWP_DRAWFRAME As Integer = &H20
	Public Const SWP_FRAMECHANGED As Integer = &H20
	Public Const SWP_SHOWWINDOW As Integer = &H40
	Public Const SWP_HIDEWINDOW As Integer = &H80
	Public Const SWP_NOCOPYBITS As Integer = &H100
	Public Const SWP_NOOWNERZORDER As Integer = &H200
	Public Const SWP_NOREPOSITION As Integer = &H200
	Public Const SWP_NOSENDCHANGING As Integer = &H400
	Public Const SWP_DEFERERASE As Integer = &H2000
	Public Const SWP_ASYNCWINDOWPOS As Integer = &H4000

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

!!!!Notes:
Taken from openNetCF in OpenNETCF.Win32.Core
SetWindowPos declaration is also required.
!!!!C# Signature:
 [DllImport("user32.dll", SetLastError=true)]
 [return: MarshalAs(UnmanagedType.Bool)]
 private static extern bool SetWindowPos(IntPtr hWnd, IntPtr hWndInsertAfter, int x, int y, int cx, int cy, uint uFlags);

Check the SWP definition on Enums.

!!!!VB.Net Signature:
 <DllImport("user32.dll", SetLastError:=True)> _
 Private Shared Function SetWindowPos(ByVal hWnd As IntPtr, _
     ByVal hWndInsertAfter As IntPtr, _
     ByVal X As Integer, _
     ByVal Y As Integer, _
     ByVal cx As Integer, _
     ByVal cy As Integer, _
     ByVal uFlags As UInteger) As Boolean
 End Function

!!!!Tips & Tricks:
Can be used to hide the start bar and start menu.

!!!!Sample Code:
!!!!Sample Code:
        public void HideStartBar()
        {
            IntPtr handle;

try
            {
                // Find the handle to the Start Bar
                handle = FindWindowCE("HHTaskBar", null);

// If the handle is found then hide the start bar
                if (handle != IntPtr.Zero)
                {
                    // Hide the start bar
                    SetWindowPos(handle, 0, 0, 0, 0, 0, SWP_HIDEWINDOW);
                }
            }
            catch
            {
                MessageBox.Show("Could not hide Start Bar.");
            }
        }

public void ShowStartBar()
        {
            IntPtr handle;

try
            {
                // Find the handle to the Start Bar
                handle = FindWindowCE("HHTaskBar", null);

// If the handle is found then show the start bar
                if (handle != IntPtr.Zero)
                {
                    // Show the start bar
                    SetWindowPos(handle, 0, 0, 0, 240, 26, SWP_SHOWWINDOW);
                }
            }
            catch
            {
                MessageBox.Show("Could not show Start Bar.");
            }
        }

Documentation: FindWindowW@msdn on MSDN