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Use this text in project file. This example shows how to minimize non-main form in the running application.

program Project1;

uses
  Forms,
  Windows,
  Messages,
  SysUtils,
  Classes,
  Graphics,
  Controls,
  Dialogs,
  Unit1 in 'Unit1.pas' {Form1},
  Unit2 in 'Unit2.pas' {Form2};
{$R *.RES}

begin
  Application.Initialize;
  Application.CreateForm(TForm1, Form1);
  Application.CreateForm(TForm2, Form2);
  Form2.Show;
  SendMessage(Form2.Handle,WM_SYSCOMMAND,SC_MINIMIZE,0);
  Application.Run;
end.