Delphi

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;