como me conecto desde delphi a sql server

[[Caral]]

Hola
Para conectar un programa a otro, estando en la misma carpeta o directorio.
Esta es una muestra de un programita completo:

Código Delphi [-]
unit Unit1;

interface

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

type
   EExecAppError = class(Exception); // exepclass

  TForm1 = class(TForm)
    Button1: TButton;
    Button2: TButton;
    // Funcion para enlazar programas
    function ExecuteApp(AppName, Params: string): TProcessInformation;
    // Procedimiento
    procedure Launch(AppName, Params: string);
    procedure Button1Click(Sender: TObject);
    procedure FormCreate(Sender: TObject);
    procedure Button2Click(Sender: TObject);

  private
  // procedimiento
   procedure appmessage(var msg:tmsg;var handled:boolean);
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

// Funcion de errores
function SysErrorMessageParam(ErrorCode: Integer; Param: string): string;
var
  Len: Integer;
  Buffer: array[0..255] of Char;
  ArgArray: array[1..1] of PChar;
begin
  ArgArray[1] := PChar(Param);
  Len := FormatMessage(Format_Message_From_System or
    Format_Message_Argument_Array, nil, ErrorCode, 0, Buffer,
    SizeOf(Buffer), @ArgArray);
  while (Len > 0) and (Buffer[Len - 1] in [#0..#32, '.']) do Dec(Len);
  SetString(Result, Buffer, Len);
end;


// funcion de enlace
function TForm1.ExecuteApp(AppName, Params: string): TProcessInformation;
var
  SI: TStartupInfo;
  PI: TProcessInformation;
begin
  FillChar(SI, SizeOf(SI), 0);
  with SI do
  begin
    cb := SizeOf(TStartupInfo);
    dwFlags := StartF_UseShowWindow;
    wShowWindow := sw_ShowNormal;
  end;
  if not CreateProcess(nil, PChar(AppName + ' ' + Params), nil,
           nil, False, 0, nil, nil, SI, PI) then
    raise EExecAppError.Create(SysErrorMessageParam(GetLastError, AppName));
  Result := PI;
end;

// procedimiento
procedure TForm1.Launch(AppName, Params: string);
begin
  ExecuteApp(AppName, Params);
end;

// mensage
procedure TForm1.appmessage(var msg:tmsg; var handled:boolean);
begin
     if (msg.message=wm_syscommand) and (msg.wparam=sc_screensave)
     then handled:=true;
end;


procedure TForm1.Button1Click(Sender: TObject);
begin
   // lanza un llamado al otro programa
   // el programa tiene que estar en el mismo directorio

    Launch('Project2','');
end;

procedure TForm1.FormCreate(Sender: TObject);
begin
   application.onmessage:=appmessage;
end;

procedure TForm1.Button2Click(Sender: TObject);
begin
   Close;
end;

end.

Saludos