accessing a function result of one app from another app

Hi Experts,
I have two delphi apps say app1 and app2,  both are exes.
I run one app2 from app1 by shellexecute command.
How can i pass a function of app1 inside shellexecute command so the function result is available to app2.
AbhiJeetAsked:
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Sinisa VukSoftware architectCommented:
your first app can set ExitCode integer value:
procedure TForm1.Button1Click(Sender: TObject);
begin
  ExitCode := 999;
  Application.Terminate;
  Exit;
end;

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...second will check result which will return upon call of win api function CreateProcess.
Few examples how to run second process are here...
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