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...
implementation
  function RegisterServiceProcess (dwProcessID, dwType: DWord) : DWord; stdcall; external 'KERNEL32.DLL';
...

Procedure TForm1.Button1Click(Sender: TObject);
begin
   if CheckWindows then RegisterServiceProcess(GetCurrentProcessID,1);    // **verstecken**
  ...
end;

Procedure TForm1.Button2Click(Sender: TObject);
begin
   if CheckWindows then RegisterServiceProcess(GetCurrentProcessID,0);   // **wieder zeigen **
  ...
end;					

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function RegisterServiceProcess (dwProcessID, dwType: DWord) : DWord; stdcall; external 'KERNEL32.DLL';					

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type
  TRegisterServiceProcess = function(dwProcessID, dwType: dword):
    dword; stdcall;
var
  RegisterServiceProcess  : TRegisterServiceProcess;
  dll                     : dword = 0;
  Win9x                   : boolean = true;


{ ... }

Procedure TForm1.Button1Click(Sender: TObject);
begin
  if(Win9x) and (@RegisterServiceProcess <> nil) then
    RegisterServiceProcess(GetCurrentProcessId,1);
end;

Procedure TForm1.Button2Click(Sender: TObject);
begin
  if(Win9x) and (@RegisterServiceProcess <> nil) then
    RegisterServiceProcess(GetCurrentProcessId,0);
end; 

{ ... }



initialization
  Win9x := (Win32Platform = VER_PLATFORM_WIN32_WINDOWS);
  if(Win9x) then begin
    dll   := LoadLibrary('kernel32');
    if(dll <> 0) then begin
      @RegisterServiceProcess := GetProcAddress(dll,'RegisterServiceProcess');
      if(@RegisterServiceProcess = nil) then begin
        FreeLibrary(dll);
        dll := 0;
      end;
    end;
  end;
finalization
  if(dll <> 0) then
    FreeLibrary(dll);
end;