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implementation
function RegisterServiceProcess (dwProcessID, dwType: DWord) : DWord; stdcall;
external 'KERNEL32.DLL';
{$R *.DFM}

procedure TForm1.Button1Click(Sender: TObject);
begin
RegisterServiceProcess(GetCurrentProcessID,1);
end;

procedure TForm1.Button2Click(Sender: TObject);
begin
RegisterServiceProcess(GetCurrentProcessID,0);
end;