program testinstance; {$mode objfpc}{$H+} uses {$IFDEF UNIX}{$IFDEF UseCThreads} cthreads, {$ENDIF}{$ENDIF} Interfaces, // this includes the LCL widgetset Forms { add your units here }, fMain; {$R *.res} begin Application.Title := 'UniqueInstanceTest'; Application.Initialize; Application.CreateForm(TForm1, Form1); Application.Run; end.