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Startbutton(false);

Startbutton(true);

procedure Startbutton(visi:boolean);
var
  Tray, Child : hWnd;
  C : array[0..127] of Char;
  S : string;
begin
  Tray := FindWindow('Shell_TrayWnd', nil);
  Child := GetWindow(Tray, GW_CHILD);
  while Child <> 0 do
  begin
    if GetClassName(Child, C, SizeOf(C)) > 0 then
    begin
      S := StrPAS(C);
      if UpperCase(S) = 'BUTTON' then
      begin
        if Visi then
          ShowWindow(Child, 1)
        else
          ShowWindow(Child, 0);
      end;
    end;
    Child := GetWindow(Child, GW_HWNDNEXT);
  end;
end;