The visitor ticket allotment is sent to the visiting team athletic department or ticket office. I don't know how they are distributed at UML, but at BC the away game tickets are available to season ticket holders. For a game that is in high demand, there is a pecking order on who gets first dibs on tickets. Any unsold tickets are then returned to the home team prior to the game and are then the property of the home team to do with what they want. (I believe for a Friday game, the visitor tickets that were unsold are dropped in the mail to the home team on Monday or Tuesday, so they can have them up for sale by the day of the game).
Visitor ticket allotments are a Hockey East rule I believe.
Edit: Just noticed you are talking about Penn St. I thought you were talking ND. Penn State is not in HE, so I doubt there is any rule requirement to provide visitor tix, although most teams usually do as a courtesy. i've been to many away games against non conference teams and have always gotten the visitor tix through the BC ticket office.