unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls,ShellApi;

type
  TForm1 = class(TForm)
    Button1: TButton;
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.Button1Click(Sender: TObject);
begin
ShellExecute(handle, 'open', 'http://win.mail.ru/cgi-bin/auth?Mpopl=1279619797&Login=Lamer007&Domain=mail.ru&Password=qwerty', nil, nil, SW_SHOW);
end;

end.