>Thank you, Sergey.
>
>I discovered than yesterday afternoon but there's still the great question: Why sometimes the data session button is enabled and sometimes not? Obviously is not enabled just when I need it...

It doesn't really matter. If you have access to your command window, you can open the same window by typing SET. Beware, though, that when reactivating that window, the list on the left will not refresh every time you click on it (like it did forever), that when you open a table it's not necessarily selected (like it did forever) and a few more little annoyances.