Usually they would abstain from voting confidence to a new government or over a law.
There will be six foreign Senators.
No non-coalition party won enough votes to be in Parliament. There will only be the two coalitions with regional minority language parties.
BTW, to you and kcurie and other night-owls: to end the comment overflow, I created a second Italy elections thread on the frontpage, please migrate over! *Lunatic*, n. One whose delusions are out of fashion.