When idle do something

unit Unit1;

interface

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

type
  TForm1 = class(TForm)
    Button1: TButton;
    Timer1: TTimer;
    Label1: TLabel;
    procedure FormCreate(Sender: TObject);
    procedure Timer1Timer(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;
  i:Integer = 0;
  hThread:THandle;
  tid:DWORD;
  suspended:Boolean = true;
implementation

{$R *.dfm}

procedure Increasekkt;
begin
repeat
Inc(i);
Form1.Caption:=IntToStr(i);
until 3=4;
end;

function GetIdleTime:DWORD;
var
last:TLastInputInfo;
begin
last.cbSize:=Sizeof(last);
GetLastInputInfo(last);
Result:=(GetTickCount - last.dwTime)div 1000;
end;

procedure TForm1.FormCreate(Sender: TObject);
begin
hThread:=CreateThread(nil,0,@Increasekkt,nil,CREATE_SUSPENDED,tid);
end;

procedure TForm1.Timer1Timer(Sender: TObject);
begin
Label1.Caption:=IntToStr(GetIdleTime);
if (GetIdleTime>5) and (Suspended) then
begin
  ResumeThread(hThread);
  suspended:=false;
end
else if (GetIdleTime<5) and (not Suspended) then
begin
  suspended:=true;
  SuspendThread(hThread);
end;
end;

end.