Hi Rocky,
and thanks for your advice.
Unfortunately, my "extended keyboard" is in Italian and the combination of shift + 3 does not work!
If I change the layout from Italian to Usa, it only works if I use the 3 key above / between the W and E keys.
If I use the 3 key, of the numeric keypad (extended keyboard), it does not work even with the US layout.
Thanks for your help !
Renato