At bare minimum I thinking that in the worse case the top of page where the UG logo/link is and also where the ads appear those areas and capabilities may be able to piggy backed onto in some manner.
Just did a quick skim of that sight.... It's all cryptic and totally unfamiliar to me so it could be referring to something completely else than I'm thinking in my mind but if I got it right there is an admin control panel. On it is a Communication section. Within that is ways to put up notices, alerts, messages, I believe including Welcome Messages, links, etc. I believe some can have time limits placed upon them. Some of it definitely refers to sending member email which in the worst case could be better than nothing but other references again if I got it right seems to refer to capabilities (unclear it builtin or via add-ons) that are available to do welcome stuff and alerts through the web.