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Clipboard.SetText(LoginName);
ActiveControl.KeyDown(VK_TAB,shift);  
Clipboard.SetText(LoginPasswort);
ActiveControl.KeyDown(vk_enter,shift);					

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Clipboard.SetText(LoginName);
ActiveControl.KeyDown(VK_TAB,shift);  
Clipboard.SetText(LoginPasswort);
ActiveControl.KeyDown(vk_enter,shift);					

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  TfrmMain = class(TForm)
  ...
  private
    FUsername, FPassword: String;
  end;

...

procedure TfrmMain.FormCreate(Sender: TObject);
begin
  frmLoginForm := TfrmLoginForm.Create(nil);
  try
    frmLoginForm.ShowModal; // Rückgabewert ggf. prüfen
    FUsername := frmLoginForm.edtUsername.Text;
    FPassword := frmLoginForm.edtPassword.Text;
  finally
    frmLoginForm.Free;
  end;
end;					

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procedure TForm1.FormCreate(Sender: TObject);
begin
Form2 := Form2.Create(nil);
  try
    Form2.ShowModal; // Rückgabewert ggf. prüfen
    FUsername := Form2.Edit1.Text;
    FPassword := Form2.MaskEdit1.Text;
  finally
    Form2.Free;
  end;
end;					

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program hallo;

uses
  Forms,
  hallo in 'hallo.pas' {Form1},
  Login in 'Login.pas' {Form2};

{$R *.res}

begin
  Application.Initialize;
  Application.CreateForm(TForm1, Form1);
  Application.Run;
end.					

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if Form2.ShowModal = mrOk then
...					

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uses
  IdHttp;

var
  HttpLoader: TIdHttp;
  PageContents: String;
begin
  HttpLoader := TIdHttp.Create;
  try
    PageContents := HttpLoader.Get('http://www.example.com/login.php?name=' + FUsername + '&pass=' + FPassword);
    if PageContents = 'erfolgreich' then
      ShowMessage('Login erfolgreich');
  finally
    HttpLoader.Free;
  end;
end;