How to hide a program from Windows

Problem/Question/Abstract:

How to hide a program from Windows

Answer:

Look at this modified project source and apply the changes to your own project:

program Project1;

uses
  Forms,
  Unit1 in 'Unit1.pas' {Form1},
  Windows;

{$R *.RES}

var
  ExtendedStyle: Integer;

begin
  Application.Initialize;
  ExtendedStyle := GetWindowLong(Application.Handle, GWL_EXSTYLE);
  SetWindowLong(Application.Handle, GWL_EXSTYLE, ExtendedStyle or WS_EX_TOOLWINDOW
    and not WS_EX_APPWINDOW);
  Application.CreateForm(TForm1, Form1);
  Application.Run;
end.