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Use for this ShowMainForm property of TApplication class in your project file.

program Project1;

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

{$R *.RES}

begin
  Application.Initialize;
  Application.ShowMainForm:=False;
  Application.CreateForm(TForm1, Form1);
  Application.Run;
end.

Related chapters
    Forms