I've just found the F5 button is my friend - it must save me seconds a week, not having to aim my cursor at the curly arrows. 
But I am not brave enough to fiddle with the others in case they lead to VeryBadThingsHappening.
Was thinking of putting a shout out to that un-paralysed one from Lost, but I thought I'd try the wisdom of wise MNetters instead.
Where do these magical squares lead me to?