procedure TForm1.FormCreate(Sender: TObject);

begin

SetWindowLong(Application.Handle, GWL_EXSTYLE, WS_EX_TOOLWINDOW);

end;

在程序运行的初期，首先激活窗体FormCreate()过程中的代码，通过SetWindowLong (Application.Handle,GWL_EXSTYLE,WS_EX_TOOLWINDOW)这条语句就可以实现从系统任务条上隐藏本程序的功能。

程序代码如下：

unit Unit1;

interface

uses

Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,

Dialogs;

type

TForm1 = class(TForm)

procedure FormCreate(Sender: TObject);

private

{ Private declarations }

public

{ Public declarations }

end;

var

Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.FormCreate(Sender: TObject);

begin

SetWindowLong(Application.Handle, GWL_EXSTYLE, WS_EX_TOOLWINDOW);

end;

end.

保存文件，然后按F9键运行程序。