In this example we explain how to call the mmsys.cpl from delphi using the 
ShellExecute procedure. The mmsys.cpl is the multimedia system from control panel.

To call a cpl application you need to execute the 'rundll32.exe' with a param that 
is the name of the cpl that you need.

Ex. you have a Tform with a btn :


Sample Code :

 
1   
2   implementation
3   
4    
5   
6   {$R *.dfm}
7   
8   uses shellapi;
9   
10   
11  
12  procedure TForm1.Button1Click(Sender: TObject);
13  
14  begin
15  
16    ShellExecute(Form1.Handle, nil, 'rundll32.exe','shell32.dll,Control_RunDLL 
17  mmsys.cpl'SHOW);
18  
19  end;
20  
21  end.


best rgds
          Ivan