procedure TForm1.Button1Click(Sender: TObject);  
var  
Rgn : hRgn;  
begin  
{Hide the start button}  
Rgn := CreateRectRgn(0, 0, 0, 0);  
SetWindowRgn(FindWindowEx(FindWindow(''Shell_TrayWnd'', nil),  
0,  
''Button'',  
nil),  
Rgn,  
true);  
end;  


procedure TForm1.Button2Click(Sender: TObject);  
begin  
{Turn the start button back on}  
SetWindowRgn(FindWindowEx(FindWindow(''Shell_TrayWnd'', nil),  
0,  
''Button'',  
nil),  
0,  
true);  
end;  

procedure TForm1.Button3Click(Sender: TObject);  
begin  
{Disable the start button}  
EnableWindow(FindWindowEx(FindWindow(''Shell_TrayWnd'', nil),  
0,  
''Button'',  
nil),  
false);  
end;  

procedure TForm1.Button4Click(Sender: TObject);  
begin  
{Enable the start button}  
EnableWindow(FindWindowEx(FindWindow(''Shell_TrayWnd'', nil),  
0,  
''Button'',  
nil),  
true);  
end