Just open the Avast! interface (works on every tab, even in settings), and press ALT on the keybord. Letters appear everywhere.
If you press it again, everything is back to normal. It’s like ALT is some kind of shortcut for this letters. Is this normal behaviour?
Yes, this are shortcuts.
DJBone
I don’t think that these are documented, which can cause confusion…but try navigating around 
The shortcuts are shown similar to some other programs…like word…
I, see now. I didn’t try to navigate, it’s working But I think it’s kind of pointless, because if I press a letter, let’s say “E” for Settings, then the letter shortcuts dissapear. Maybe it’s a good thing to let the user disable it by pressing ALT again.