it basically works this way : Totti is the lone man upfront, with a trident that usually consist of Perrotta, Mancini, n Taddei behind him. when Totti gets the ball, he will hold it up n draw away the backline to allow those behind him to roam forward to open space. n if he cant find any open man, he'll juz go by himself or pass back.

of coz there is a major setback in this way : it wouldn't work good if Totti is not there bcoz of his vision, ability to hold up n the passing.

another read here :

Roaming Roma find follower in Sir Alex Ferguson